Help/Libraries/JITLib/tutorials/jitlib_basic_concepts_02.html

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  37 <p class="p1"><b>proxy space - basic concepts<span class="Apple-converted-space">  <span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span></span></b><span class="s1"><b>2</b></span></p>
  38 <p class="p2"><br></p>
  39 <p class="p2"><br></p>
  40 <p class="p3">external structure of the node proxy, referencing in proxyspace and environments.</p>
  41 <p class="p4"><br></p>
  42 <p class="p5"><span class="s2">previous: <a href="jitlib_basic_concepts_01.html"><span class="s3">jitlib_basic_concepts_01</span></a><span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span>next: <a href="jitlib_basic_concepts_03.html"><span class="s3">jitlib_basic_concepts_03</span></a><span class="Apple-converted-space"> </span></span></p>
  43 <p class="p4"><br></p>
  44 <p class="p2"><br></p>
  45 <p class="p3">This document covers:</p>
  46 <p class="p4"><br></p>
  47 <p class="p3">a) <span class="Apple-tab-span">  </span>normal environment lookup</p>
  48 <p class="p3">b) <span class="Apple-tab-span">  </span>proxyspace as an environment</p>
  49 <p class="p3">c) <span class="Apple-tab-span">  </span>using the proxyspace to change processes on the fly</p>
  50 <p class="p3">d) <span class="Apple-tab-span">  </span>when are the node proxies initialized?</p>
  51 <p class="p3">e) <span class="Apple-tab-span">  </span>moving out of the proxy space</p>
  52 <p class="p3">f ) <span class="Apple-tab-span"> </span>using ProxySpace together with other Environments</p>
  53 <p class="p2"><br></p>
  54 <p class="p2"><br></p>
  55 <p class="p2"><br></p>
  56 <p class="p2"><br></p>
  57 <p class="p2"><br></p>
  58 <p class="p3"><b>a) normal environment lookup</b></p>
  59 <p class="p2"><br></p>
  60 <p class="p2"><br></p>
  61 <p class="p2"><br></p>
  62 <p class="p6"><span class="s2">currentEnvironment.postln; </span>// anEnvironment (if not, you haven't left it from last helppage..)</p>
  63 <p class="p2"><br></p>
  64 <p class="p6"><span class="s2">~a; </span>// access the environment: there is nothing stored: nil</p>
  65 <p class="p6"><span class="s2">~a = 9; </span>// store something</p>
  66 <p class="p6"><span class="s2">~a; <span class="Apple-tab-span">        </span></span>// now 9 is stored</p>
  67 <p class="p6"><span class="s2">~a + 100; </span>// calculate with it</p>
  68 <p class="p2"><br></p>
  69 <p class="p6"><span class="s2">currentEnvironment.postln; </span>// the value is stored in the environment</p>
  70 <p class="p2"><br></p>
  71 <p class="p6"><span class="s2">~b + ~a; </span>// cause an error: ~b is nil.</p>
  72 <p class="p7">~b = -90; <span class="s4">// set ~b</span></p>
  73 <p class="p2"><br></p>
  74 <p class="p6"><span class="s2">~b + ~a; </span>// now this works.</p>
  75 <p class="p2"><br></p>
  76 <p class="p6">// note that you can always access environments (or ProxySpaces) from outside as well:</p>
  77 <p class="p2"><br></p>
  78 <p class="p7">x = currentEnvironment;</p>
  79 <p class="p6"><span class="s2">x[</span><span class="s5">\a</span><span class="s2">] + x[</span><span class="s5">\b</span><span class="s2">] </span>// equivalent to ~b + ~a</p>
  80 <p class="p8"><br></p>
  81 <p class="p6">// or, if "know" is true, you can access named things with message-like syntax:</p>
  82 <p class="p7">x.know = <span class="s6">true</span>;</p>
  83 <p class="p7">x.a + x.b;</p>
  84 <p class="p2"><br></p>
  85 <p class="p2"><br></p>
  86 <p class="p2"><br></p>
  87 <p class="p2"><br></p>
  88 <p class="p2"><br></p>
  89 <p class="p7"><span class="Apple-tab-span">     </span>further readings: <a href="../../../Collections/Environment.html"><span class="s7">Environment</span></a></p>
  90 <p class="p2"><br></p>
  91 <p class="p2"><br></p>
  92 <p class="p2"><br></p>
  93 <p class="p2"><br></p>
  94 <p class="p2"><br></p>
  95 <p class="p3"><b>b) a proxyspace as an environment</b></p>
  96 <p class="p2"><br></p>
  97 <p class="p2"><br></p>
  98 <p class="p3">one can replace the current environment with a special type of environment, a ProxySpace.</p>
  99 <p class="p3">this environment represents processes that play audio on a server.</p>
 100 <p class="p2"><br></p>
 101 <p class="p2"><br></p>
 102 <p class="p6"><span class="s2">p = </span><span class="s6">ProxySpace</span><span class="s2">.new(s); </span>// create a new environment, store it in variable p for now.</p>
 103 <p class="p6"><span class="s2">p.push;<span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// push it, so i becomes the current environment.</p>
 104 <p class="p7">currentEnvironment.postln;<span class="Apple-converted-space"> </span></p>
 105 <p class="p7">currentEnvironment === p; <span class="s4">// and they are identical.</span></p>
 106 <p class="p2"><br></p>
 107 <p class="p6"><span class="s2">~x;<span class="Apple-tab-span"> </span><span class="Apple-tab-span">    </span></span>// accessing creates a NodeProxy (uninitialized) automatically.</p>
 108 <p class="p6"><span class="s2">~x + ~y; <span class="Apple-tab-span">   </span></span>// this works immediately, because the lookup does not return nil,<span class="Apple-converted-space"> </span></p>
 109 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-converted-space">    </span></span>// but a placeholder (proxy) instead</p>
 110 <p class="p2"><br></p>
 111 <p class="p6"><span class="s2">p.postln; </span>// now there are two empty placeholders in the environment.</p>
 112 <p class="p2"><br></p>
 113 <p class="p2"><br></p>
 114 <p class="p2"><br></p>
 115 <p class="p2"><br></p>
 116 <p class="p2"><br></p>
 117 <p class="p2"><br></p>
 118 <p class="p3"><b>c) using the proxyspace to change processes on the fly</b></p>
 119 <p class="p2"><br></p>
 120 <p class="p2"><br></p>
 121 <p class="p6">//<span class="Apple-converted-space">  </span>boot the server</p>
 122 <p class="p7">s.boot;</p>
 123 <p class="p2"><br></p>
 124 <p class="p2"><br></p>
 125 <p class="p6">// as soon as a sound function (or any compatible input) is assigned to a proxy</p>
 126 <p class="p6">// this sound plays on its own private bus (so it is not audible yet.)</p>
 127 <p class="p7">(</p>
 128 <p class="p7">~x = {</p>
 129 <p class="p2"><span class="Apple-tab-span">     </span></p>
 130 <p class="p7"><span class="Apple-tab-span">     </span><span class="s6">RLPF</span>.ar(<span class="s6">Impulse</span>.ar(4) * 20, [850, 950], 0.2)</p>
 131 <p class="p2"><span class="Apple-tab-span">     </span></p>
 132 <p class="p7">}</p>
 133 <p class="p7">)</p>
 134 <p class="p2"><br></p>
 135 <p class="p6">// the proxy has been initialized by its first assignment.</p>
 136 <p class="p6">// it plays at audio rate (because we have assigned an audio rate ugen function)</p>
 137 <p class="p6">// and it has two channels (because the function has stereo output)</p>
 138 <p class="p2"><br></p>
 139 <p class="p6"><span class="s2">~x.index; </span>// a nodeproxy owns a private bus, so its signal can be used in diverse ways.<span class="Apple-converted-space"> </span></p>
 140 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>// what is the proxy bus's index? this posts the index to the postwindow<span class="Apple-converted-space"> </span></p>
 141 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>// before it was .ir(nil), now it is initialized to .ar(2)</p>
 142 <p class="p2"><br></p>
 143 <p class="p6"><span class="s2">~x.bus </span>// what is the proxy's bus?</p>
 144 <p class="p2"><br></p>
 145 <p class="p2"><br></p>
 146 <p class="p6"><span class="s2">~x.play; </span>// now listen to it. a monitor is created (see <a href="../nodeproxy/Monitor.html"><span class="s8">Monitor</span></a>) that plays the signal</p>
 147 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>// onto a public bus - by default, this is bus 0, the first audio output bus.</p>
 148 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>// This monitoring function is independent of the proxy itself.</p>
 149 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>// for further info see: <a href="jitlib_basic_concepts_03.html"><span class="s8">jitlib_basic_concepts_03</span></a> (part c)</p>
 150 <p class="p8"><br></p>
 151 <p class="p2"><br></p>
 152 <p class="p2"><br></p>
 153 <p class="p6">// the sound function can be changed at any time:</p>
 154 <p class="p7">(</p>
 155 <p class="p7">~x = {</p>
 156 <p class="p7"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">RLPF</span>.ar(<span class="s6">Impulse</span>.ar([5, 7]) * 5, [1450, 1234], 0.2)</p>
 157 <p class="p7">}</p>
 158 <p class="p7">)</p>
 159 <p class="p2"><br></p>
 160 <p class="p6">// You can tune a sound function to your liking very easily</p>
 161 <p class="p6">// by replacing it with little (or big) variations:</p>
 162 <p class="p2"><br></p>
 163 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// filter freqs higher:</p>
 164 <p class="p7">~x = {<span class="Apple-tab-span">       </span><span class="s6">RLPF</span>.ar(<span class="s6">Impulse</span>.ar([5, 7]) * 5, [1800, 2000], 0.2) }</p>
 165 <p class="p2"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
 166 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// same pulse ratio (5/8), different pulse tempo:</p>
 167 <p class="p7">~x = {<span class="Apple-tab-span">       </span><span class="s6">RLPF</span>.ar(<span class="s6">Impulse</span>.ar([5, 8] * 3.2) * 5, [1800, 2000], 0.2) }</p>
 168 <p class="p2"><br></p>
 169 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// different filter:</p>
 170 <p class="p7">~x = {<span class="Apple-tab-span">       </span><span class="s6">Ringz</span>.ar(<span class="s6">Impulse</span>.ar([5, 8] * 3.2), [1800, 2000], 0.05) }</p>
 171 <p class="p2"><br></p>
 172 <p class="p6">// and if you set the proxy's fadeTime, you can create little<span class="Apple-converted-space"> </span></p>
 173 <p class="p6">// textures by hand:<span class="Apple-converted-space"> </span></p>
 174 <p class="p2"><br></p>
 175 <p class="p7">~x.fadeTime = 3;<span class="Apple-converted-space"> </span></p>
 176 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span>// different filter freqs every time:</p>
 177 <p class="p7">~x = {<span class="Apple-tab-span">       </span><span class="s6">Ringz</span>.ar(<span class="s6">Impulse</span>.ar([5, 8] * rrand(0.5, 1.5)) * 0.5, ({ exprand(200, 4000) } ! 2), 0.05) }</p>
 178 <p class="p2"><br></p>
 179 <p class="p2"><br></p>
 180 <p class="p2"><br></p>
 181 <p class="p6">// here is another proxy:</p>
 182 <p class="p7">~y = { <span class="s6">Pan2</span>.ar(<span class="s6">Dust</span>.ar(20), 0) };</p>
 183 <p class="p2"><br></p>
 184 <p class="p6"><span class="s2">~y.bus; </span>// it has two channels, just as the ~x., but it plays on another (private) bus.</p>
 185 <p class="p2"><br></p>
 186 <p class="p6">// note that ~y is not audible directly,</p>
 187 <p class="p6">// but it can be used like a UGen in any other proxy:</p>
 188 <p class="p7">(</p>
 189 <p class="p7">~x = {</p>
 190 <p class="p2"><span class="Apple-tab-span">     </span></p>
 191 <p class="p7"><span class="Apple-tab-span">     </span><span class="s6">RLPF</span>.ar(~y.ar * 8,<span class="Apple-converted-space">  </span>[1450, 1234], 0.2)</p>
 192 <p class="p7">}</p>
 193 <p class="p7">)</p>
 194 <p class="p2"><br></p>
 195 <p class="p6">// when the proxy changes, the result changes dynamically:</p>
 196 <p class="p2"><br></p>
 197 <p class="p7">~y = { <span class="s6">Impulse</span>.ar(<span class="s6">MouseX</span>.kr(2, 18, 1)) * [1, 1] };</p>
 198 <p class="p2"><br></p>
 199 <p class="p7">~y = { <span class="s6">PinkNoise</span>.ar(<span class="s6">MouseX</span>.kr(0, 0.2) * [1, 1]) };</p>
 200 <p class="p2"><br></p>
 201 <p class="p7">~y = { <span class="s6">Impulse</span>.ar([<span class="s6">MouseX</span>.kr(2, 18, 1), <span class="s6">MouseY</span>.kr(2, 18, 1)]) };</p>
 202 <p class="p2"><br></p>
 203 <p class="p2"><br></p>
 204 <p class="p2"><br></p>
 205 <p class="p6">// stop listening. the proxies run in the background.</p>
 206 <p class="p2"><br></p>
 207 <p class="p7">~x.stop;</p>
 208 <p class="p2"><br></p>
 209 <p class="p6"><span class="s2">~y.bus; </span>// ~y is playing on a different bus ...</p>
 210 <p class="p6"><span class="s2">~x.bus; </span>// than ~x.</p>
 211 <p class="p2"><br></p>
 212 <p class="p6">// we can also listen to ~y directly:</p>
 213 <p class="p7">~y.play;</p>
 214 <p class="p2"><br></p>
 215 <p class="p6">// to remove a proxy source, nil can be used:</p>
 216 <p class="p2"><br></p>
 217 <p class="p7">~y = <span class="s6">nil</span>;</p>
 218 <p class="p2"><br></p>
 219 <p class="p6">// stop listening</p>
 220 <p class="p7">~y.stop;</p>
 221 <p class="p2"><br></p>
 222 <p class="p2"><br></p>
 223 <p class="p5"><span class="s9"><span class="Apple-tab-span">    </span></span><span class="s2">further readings: <a href="proxyspace_examples.html"><span class="s10">proxyspace_examples</span></a> <a href="../../../ServerArchitecture/Bus.html"><span class="s3">Bus</span></a> <a href="../../../Core/Kernel/AbstractFunction.html"><span class="s3">AbstractFunction</span></a> <a href="../../../UGens/UGens.html"><span class="s3">UGens</span></a></span></p>
 224 <p class="p2"><br></p>
 225 <p class="p2"><br></p>
 226 <p class="p2"><br></p>
 227 <p class="p2"><br></p>
 228 <p class="p2"><br></p>
 229 <p class="p3"><b>d) when are the node proxies initialized?</b></p>
 230 <p class="p2"><br></p>
 231 <p class="p3">bus initialization of a node proxy happens as soon as it is used for the first time.</p>
 232 <p class="p3">later inputs are adjusted to this bus, as far as it is possible.</p>
 233 <p class="p2"><br></p>
 234 <p class="p2"><br></p>
 235 <p class="p7">~z2 = { <span class="s6">LFNoise0</span>.kr([1, 2, 3, 4]) }; // a four channel control rate proxy</p>
 236 <p class="p7">~z2.bus.postln;</p>
 237 <p class="p2"><br></p>
 238 <p class="p7">~z100 = 0.5; // a constant value creates a single channel control rate proxy.</p>
 239 <p class="p7">~z100.bus.postln;</p>
 240 <p class="p2"><br></p>
 241 <p class="p7">~z34.ar(3) <span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span>// the first access (with a numChannels argument) allocates the bus</p>
 242 <p class="p7">~z34.bus.postln;<span class="Apple-tab-span">     </span>// a 3 channel audio proxy</p>
 243 <p class="p2"><br></p>
 244 <p class="p6">// these initializations can be removed by using clear:</p>
 245 <p class="p7">~z34.clear;</p>
 246 <p class="p7">~z34.bus.postln;</p>
 247 <p class="p2"><br></p>
 248 <p class="p3">This initialisation happens whenever the proxy is first used. Later, the proxy can</p>
 249 <p class="p3">be accessed with other rate/numChannels combinations as needed (rates are converted,</p>
 250 <p class="p3">numChannels are extended by wrapping, sources with too many channels are wrapped).</p>
 251 <p class="p4"><br></p>
 252 <p class="p3">Note that this might cause ambiguous initialisation in which case the proxy should</p>
 253 <p class="p3">be always initialized first. A typical problem is demonstrated here:</p>
 254 <p class="p2"><br></p>
 255 <p class="p7">~u.play(0, 2); <span class="Apple-tab-span">      </span>// initialize 2 audio channels (default). 0 is the output bus number.</p>
 256 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// if the proxy is not inititialized, play defaults to 2 channels.</p>
 257 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// here it is explicitly given only to make it more clear.</p>
 258 <p class="p7">~u = { <span class="s6">PinkNoise</span>.ar(0.2) }; <span class="s4">// use only one</span></p>
 259 <p class="p7">~u.numChannels; <span class="s4">// 2 channels</span></p>
 260 <p class="p7">~u.clear;</p>
 261 <p class="p2"><br></p>
 262 <p class="p3">if evaluated the other way round, only one channel is used:</p>
 263 <p class="p2"><br></p>
 264 <p class="p7">~u = { <span class="s6">PinkNoise</span>.ar(0.2) }; // initialize 1 audio channel</p>
 265 <p class="p7">~u.play(0, 2); <span class="Apple-tab-span">      </span>// play 2 channels: the 1 channel is expanded into 2.</p>
 266 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// numChannels of .play defaults to the proxy's numChannels.</p>
 267 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// here it is explicitly given, so to expand the channels</p>
 268 <p class="p7">~u.numChannels; <span class="s4">// 1 channel</span></p>
 269 <p class="p7">~u.clear;</p>
 270 <p class="p8"><br></p>
 271 <p class="p3">Thus it can be useful to explicitly initialize proxies that use variable type inputs:</p>
 272 <p class="p8"><br></p>
 273 <p class="p7">~b.kr(8); ~c.ar; // explicit initialisation</p>
 274 <p class="p7">p.postln;<span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// post the whole proxy space</p>
 275 <p class="p2"><br></p>
 276 <p class="p2"><br></p>
 277 <p class="p2"><br></p>
 278 <p class="p3"><b>e) moving out of the proxy space:</b></p>
 279 <p class="p2"><br></p>
 280 <p class="p2"><br></p>
 281 <p class="p6">// play the audio:</p>
 282 <p class="p7">~x.play;</p>
 283 <p class="p2"><br></p>
 284 <p class="p7">~x = { <span class="s6">PinkNoise</span>.ar(0.5) };</p>
 285 <p class="p2"><br></p>
 286 <p class="p6">// p is the proxy space:</p>
 287 <p class="p7">p.postln;</p>
 288 <p class="p2"><br></p>
 289 <p class="p6">// to end all processes in p, use end:</p>
 290 <p class="p7">p.end(2) // 2 seconds fade out.</p>
 291 <p class="p2"><br></p>
 292 <p class="p6">// to remove all bus objects and free them from the bus allocato, use clear:</p>
 293 <p class="p7">p.clear;</p>
 294 <p class="p2"><br></p>
 295 <p class="p7">currentEnvironment.postln;</p>
 296 <p class="p2"><br></p>
 297 <p class="p6">// restore original environment:</p>
 298 <p class="p2"><br></p>
 299 <p class="p7">p.pop;</p>
 300 <p class="p2"><br></p>
 301 <p class="p7">currentEnvironment.postln;</p>
 302 <p class="p2"><br></p>
 303 <p class="p7">~a + ~b; // the old values are still here.</p>
 304 <p class="p8"><br></p>
 305 <p class="p7">p === currentEnvironment; // this is not the case anymore.</p>
 306 <p class="p2"><br></p>
 307 <p class="p6">// remove the content, so the garbage collector can release their memory.</p>
 308 <p class="p7">p.clear;</p>
 309 <p class="p2"><br></p>
 310 <p class="p6">// note that if you use this kind of accessing scheme, the objects are not garbage collected</p>
 311 <p class="p6">// until the keys are set to nil. This is a common mistake when using normal environments.</p>
 312 <p class="p2"><br></p>
 313 <p class="p6">// clear all in the normal environment:</p>
 314 <p class="p2"><br></p>
 315 <p class="p7">currentEnvironment.clear;</p>
 316 <p class="p2"><br></p>
 317 <p class="p2"><br></p>
 318 <p class="p2"><br></p>
 319 <p class="p2"><br></p>
 320 <p class="p2"><br></p>
 321 <p class="p3"><b>f) using ProxySpace together with other Environments</b></p>
 322 <p class="p2"><br></p>
 323 <p class="p3">using proxy space as an access scheme for node proxies can get in the way of the</p>
 324 <p class="p3">normal use of environments as pseudo variables. Here are some ways to cope with this.</p>
 325 <p class="p4"><br></p>
 326 <p class="p9">//////////////<span class="Apple-tab-span">       </span>EnvirDocument is currently unavailable ////////////</p>
 327 <p class="p9">//// if you want to keep using the current environment as usual, you can restrict the</p>
 328 <p class="p9">//// scope of proxyspace to one document (note: this is mac-only currently)</p>
 329 <p class="p9">//</p>
 330 <p class="p9">//EnvirDocument(p, "proxyspace"); <span class="Apple-tab-span">   </span>// to test this, check for currentEnvironment here<span class="Apple-converted-space"> </span></p>
 331 <p class="p9">//<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// and in the envir document.</p>
 332 <p class="p10"><br></p>
 333 <p class="p9">// you can also access the proxy space and the proxies in it indirectly:</p>
 334 <p class="p11">p[<span class="s11">\x</span>].play;</p>
 335 <p class="p11">p[<span class="s11">\x</span>] = { <span class="s12">SinOsc</span>.ar(450, 0, 0.1) };</p>
 336 <p class="p10"><br></p>
 337 <p class="p9">// or: when the proxyspace is pushed, you can use a normal environment indirectly:</p>
 338 <p class="p11">p.push;</p>
 339 <p class="p11">d = ();</p>
 340 <p class="p11">d[<span class="s11">\buffer1</span>] = <span class="s12">Buffer</span>.alloc(s, 1024);</p>
 341 <p class="p9"><span class="s2">d.use { ~buffer1.postln; ~zz = 81; }; </span>// for more than one access to the environment, use .use</p>
 342 <p class="p10"><br></p>
 343 <p class="p10"><br></p>
 344 <p class="p9">// to access the inner environment of proxy space directly,<span class="Apple-converted-space"> </span></p>
 345 <p class="p9">// e.g. to check whether a proxy exists, one can use .envir:</p>
 346 <p class="p10"><br></p>
 347 <p class="p11">p.envir.postln;</p>
 348 <p class="p9"><span class="s2">p.envir[</span><span class="s11">\x</span><span class="s2">].postln;<span class="Apple-tab-span">        </span></span>// a proxy with this name exists<span class="Apple-converted-space"> </span></p>
 349 <p class="p9"><span class="s2">p.envir[</span><span class="s11">\nono</span><span class="s2">].postln;<span class="Apple-tab-span">     </span></span>// there is no proxy with this name.<span class="Apple-converted-space"> </span></p>
 350 <p class="p10"><br></p>
 351 <p class="p9">// p[\nono].postln; <span class="Apple-tab-span"> </span>// this access would have created a new proxy called \nono.</p>
 352 <p class="p2"><br></p>
 353 <p class="p2"><br></p>
 354 <p class="p2"><br></p>
 355 <p class="p5"><span class="s2">previous: <a href="jitlib_basic_concepts_01.html"><span class="s3">jitlib_basic_concepts_01</span></a><span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span>next: <a href="jitlib_basic_concepts_03.html"><span class="s3">jitlib_basic_concepts_03</span></a><span class="Apple-converted-space"> </span></span></p>
 356 <p class="p2"><br></p>
 357 </body>
 358 </html>