Help/Core/if.html

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  31 <p class="p1"><b>if</b></p>
  32 <p class="p2"><br></p>
  33 <p class="p3"><br></p>
  34 <p class="p4"><b>if( boolean, trueFunc, falseFunc)</b></p>
  35 <p class="p3"><br></p>
  36 <p class="p3"><br></p>
  37 <p class="p5"><span class="s1">see also: <a href="../Language/Control-Structures.html"><span class="s2">Control-Structures</span></a></span></p>
  38 <p class="p3"><br></p>
  39 <p class="p3"><br></p>
  40 <p class="p3"><br></p>
  41 <p class="p6"><span class="s1">if ( [<span class="s3">false</span>, <span class="s3">true</span>].choose,<span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>// Boolean expression (chooses one at random)</p>
  42 <p class="p7"><span class="s1"><span class="Apple-tab-span">    </span>{ "expression was true".postln },<span class="Apple-tab-span">   </span><span class="s4">// true function</span></p>
  43 <p class="p7"><span class="s1"><span class="Apple-tab-span">    </span>{ "expression was false".postln }<span class="Apple-tab-span">   </span><span class="s4">// false function</span></p>
  44 <p class="p8">)</p>
  45 <p class="p3"><br></p>
  46 <p class="p8">(</p>
  47 <p class="p8"><span class="s3">var</span> a = 1, z;</p>
  48 <p class="p8">z = if (a &lt; 5, { 100 },{ 200 });</p>
  49 <p class="p8">z.postln;</p>
  50 <p class="p8">)</p>
  51 <p class="p3"><br></p>
  52 <p class="p3"><br></p>
  53 <p class="p4"><b>UGens can also use if</b></p>
  54 <p class="p3"><br></p>
  55 <p class="p4">the condition ugen is 0 / 1<span class="Apple-converted-space"> </span></p>
  56 <p class="p3"><br></p>
  57 <p class="p8">(</p>
  58 <p class="p8"><span class="Apple-tab-span">     </span>{</p>
  59 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>if( <span class="s5">LFNoise1</span>.kr(1.0,0.5,0.5) , <span class="s5">SinOsc</span>.ar, <span class="s5">Saw</span>.ar )</p>
  60 <p class="p8"><span class="Apple-tab-span">     </span>}.play</p>
  61 <p class="p9">)</p>
  62 <p class="p3"><br></p>
  63 <p class="p3"><br></p>
  64 <p class="p4">ADVANCED:<span class="Apple-converted-space"> </span></p>
  65 <p class="p10"><br></p>
  66 <p class="p4">the functions will be inlined, which plucks the code from the functions and uses a more efficient jump statement.</p>
  67 <p class="p3"><br></p>
  68 <p class="p8">{</p>
  69 <p class="p8"><span class="Apple-tab-span">     </span>if( 6 == 9,{</p>
  70 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
  71 <p class="p8"><span class="Apple-tab-span">     </span>},{</p>
  72 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
  73 <p class="p8"><span class="Apple-tab-span">     </span>})</p>
  74 <p class="p8">}.def.dumpByteCodes</p>
  75 <p class="p3"><br></p>
  76 <p class="p8">BYTECODES: (18)</p>
  77 <p class="p8"><span class="Apple-converted-space">  </span>0 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 06<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 6</p>
  78 <p class="p8"><span class="Apple-converted-space">  </span>2 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 09<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 9</p>
  79 <p class="p8"><span class="Apple-converted-space">  </span>4 <span class="Apple-converted-space">  </span>E6 <span class="Apple-converted-space">      </span>SendSpecialBinaryArithMsg <span class="s7">'=='</span></p>
  80 <p class="p8"><span class="Apple-converted-space">  </span>5 <span class="Apple-converted-space">  </span><span class="s5">F8</span> 00 06 <span class="s5">JumpIfFalse</span> 6<span class="Apple-converted-space">  </span>(14)</p>
  81 <p class="p8"><span class="Apple-converted-space">  </span>8 <span class="Apple-converted-space">  </span>42 <span class="Apple-converted-space">      </span><span class="s5">PushLiteral</span> <span class="s6">"hello"</span></p>
  82 <p class="p8"><span class="Apple-converted-space">  </span>9 <span class="Apple-converted-space">  </span><span class="s5">A1</span> 00<span class="Apple-converted-space">    </span><span class="s5">SendMsg</span> <span class="s7">'postln'</span></p>
  83 <p class="p8"><span class="Apple-converted-space"> </span>11 <span class="Apple-converted-space">  </span><span class="s5">FC</span> 00 03 <span class="s5">JumpFwd</span> 3<span class="Apple-converted-space">  </span>(17)</p>
  84 <p class="p8"><span class="Apple-converted-space"> </span>14 <span class="Apple-converted-space">  </span>41 <span class="Apple-converted-space">      </span><span class="s5">PushLiteral</span> <span class="s6">"hello"</span></p>
  85 <p class="p8"><span class="Apple-converted-space"> </span>15 <span class="Apple-converted-space">  </span><span class="s5">A1</span> 00<span class="Apple-converted-space">    </span><span class="s5">SendMsg</span> <span class="s7">'postln'</span></p>
  86 <p class="p8"><span class="Apple-converted-space"> </span>17 <span class="Apple-converted-space">  </span><span class="s5">F2</span> <span class="Apple-converted-space">      </span><span class="s5">BlockReturn</span></p>
  87 <p class="p8">a FunctionDef in closed FunctionDef</p>
  88 <p class="p3"><br></p>
  89 <p class="p3"><br></p>
  90 <p class="p3"><br></p>
  91 <p class="p3"><br></p>
  92 <p class="p3"><br></p>
  93 <p class="p4"><b>failure to inline due to variable declarations</b></p>
  94 <p class="p8">{</p>
  95 <p class="p3"><br></p>
  96 <p class="p8"><span class="Apple-tab-span">     </span>if( 6 == 9,{</p>
  97 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s5">var</span> notHere;</p>
  98 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
  99 <p class="p8"><span class="Apple-tab-span">     </span>},{</p>
 100 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
 101 <p class="p8"><span class="Apple-tab-span">     </span>})</p>
 102 <p class="p3"><br></p>
 103 <p class="p8">}.def.dumpByteCodes</p>
 104 <p class="p3"><br></p>
 105 <p class="p8">WARNING: <span class="s5">FunctionDef</span> contains variable declarations and so will not be inlined.</p>
 106 <p class="p8"><span class="Apple-converted-space">   </span>in file 'selected text'</p>
 107 <p class="p8"><span class="Apple-converted-space">   </span>line 4 char 14 :</p>
 108 <p class="p8"><span class="Apple-converted-space">  <span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span></span><span class="s5">var</span> notHere;•</p>
 109 <p class="p8"><span class="Apple-converted-space">  <span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span></span><span class="s6">"hello"</span>.postln;</p>
 110 <p class="p8">-----------------------------------</p>
 111 <p class="p8">BYTECODES: (12)</p>
 112 <p class="p8"><span class="Apple-converted-space">  </span>0 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 06<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 6</p>
 113 <p class="p8"><span class="Apple-converted-space">  </span>2 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 09<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 9</p>
 114 <p class="p8"><span class="Apple-converted-space">  </span>4 <span class="Apple-converted-space">  </span>E6 <span class="Apple-converted-space">      </span>SendSpecialBinaryArithMsg <span class="s7">'=='</span></p>
 115 <p class="p8"><span class="Apple-converted-space">  </span>5 <span class="Apple-converted-space">  </span>04 00<span class="Apple-converted-space">    </span><span class="s5">PushLiteralX</span> instance of <span class="s5">FunctionDef</span> in closed <span class="s5">FunctionDef</span></p>
 116 <p class="p8"><span class="Apple-converted-space">  </span>7 <span class="Apple-converted-space">  </span>04 01<span class="Apple-converted-space">    </span><span class="s5">PushLiteralX</span> instance of <span class="s5">FunctionDef</span> in closed <span class="s5">FunctionDef</span></p>
 117 <p class="p8"><span class="Apple-converted-space">  </span>9 <span class="Apple-converted-space">  </span>C3 0B<span class="Apple-converted-space">    </span>SendSpecialMsg <span class="s7">'if'</span></p>
 118 <p class="p8"><span class="Apple-converted-space"> </span>11 <span class="Apple-converted-space">  </span><span class="s5">F2</span> <span class="Apple-converted-space">      </span><span class="s5">BlockReturn</span></p>
 119 <p class="p8">a FunctionDef in closed FunctionDef</p>
 120 <p class="p3"><br></p>
 121 <p class="p3"><br></p>
 122 <p class="p3"><br></p>
 123 <p class="p3"><br></p>
 124 <p class="p3"><br></p>
 125 <p class="p8">{</p>
 126 <p class="p8"><span class="Apple-tab-span">     </span>if( 6 == 9,{</p>
 127 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
 128 <p class="p8"><span class="Apple-tab-span">     </span>},{</p>
 129 <p class="p8"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s6">"hello"</span>.postln;</p>
 130 <p class="p8"><span class="Apple-tab-span">     </span>})</p>
 131 <p class="p8">}.def.dumpByteCodes</p>
 132 <p class="p3"><br></p>
 133 <p class="p8">BYTECODES: (18)</p>
 134 <p class="p8"><span class="Apple-converted-space">  </span>0 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 06<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 6</p>
 135 <p class="p8"><span class="Apple-converted-space">  </span>2 <span class="Apple-converted-space">  </span><span class="s5">FE</span> 09<span class="Apple-converted-space">    </span><span class="s5">PushPosInt</span> 9</p>
 136 <p class="p8"><span class="Apple-converted-space">  </span>4 <span class="Apple-converted-space">  </span>E6 <span class="Apple-converted-space">      </span>SendSpecialBinaryArithMsg <span class="s7">'=='</span></p>
 137 <p class="p8"><span class="Apple-converted-space">  </span>5 <span class="Apple-converted-space">  </span><span class="s5">F8</span> 00 06 <span class="s5">JumpIfFalse</span> 6<span class="Apple-converted-space">  </span>(14)</p>
 138 <p class="p8"><span class="Apple-converted-space">  </span>8 <span class="Apple-converted-space">  </span>42 <span class="Apple-converted-space">      </span><span class="s5">PushLiteral</span> <span class="s6">"hello"</span></p>
 139 <p class="p8"><span class="Apple-converted-space">  </span>9 <span class="Apple-converted-space">  </span><span class="s5">A1</span> 00<span class="Apple-converted-space">    </span><span class="s5">SendMsg</span> <span class="s7">'postln'</span></p>
 140 <p class="p8"><span class="Apple-converted-space"> </span>11 <span class="Apple-converted-space">  </span><span class="s5">FC</span> 00 03 <span class="s5">JumpFwd</span> 3<span class="Apple-converted-space">  </span>(17)</p>
 141 <p class="p8"><span class="Apple-converted-space"> </span>14 <span class="Apple-converted-space">  </span>41 <span class="Apple-converted-space">      </span><span class="s5">PushLiteral</span> <span class="s6">"hello"</span></p>
 142 <p class="p8"><span class="Apple-converted-space"> </span>15 <span class="Apple-converted-space">  </span><span class="s5">A1</span> 00<span class="Apple-converted-space">    </span><span class="s5">SendMsg</span> <span class="s7">'postln'</span></p>
 143 <p class="p8"><span class="Apple-converted-space"> </span>17 <span class="Apple-converted-space">  </span><span class="s5">F2</span> <span class="Apple-converted-space">      </span><span class="s5">BlockReturn</span></p>
 144 <p class="p8">a FunctionDef in closed FunctionDef</p>
 145 <p class="p3"><br></p>
 146 <p class="p3"><br></p>
 147 <p class="p3"><br></p>
 148 <p class="p2"><br></p>
 149 <p class="p2"><br></p>
 150 <p class="p2"><br></p>
 151 <p class="p2"><br></p>
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