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copied!<p>while-- is the way to go</p> <pre><code>var a=[],b=10;while(b--)a[b]=b+1 </code></pre> <p>returns [1,2,3,4,5,6,7,8,9,10]</p> <p>explained with start & length</p> <pre><code>var array=[],length=20,start=5;while(length--)array[length]=length+start </code></pre> <p>returns [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24] </p> <p>want range?</p> <p>explained with start & end</p> <pre><code>var array=[],end=30,start=25,a=end-start+1;while(a--)array[a]=end-- </code></pre> <p>returns [25, 26, 27, 28, 29, 30]</p> <p>for --</p> <pre><code>for(var a=[],b=20;b>0;b--,a[b]=b+1) </code></pre> <p>for++</p> <pre><code>for(var a=[],b=0;b<20;b++,a[b]=b+1) </code></pre> <p>WHY is this theway to go?</p> <ol> <li><p>while -- is prolly the fastest loop;</p></li> <li><p>direct setting is faster than push & concat;</p></li> <li><p>[] is also faster than new Array(10);</p></li> <li><p>it's not much longer code than all the others</p></li> </ol> <p>byte saving techniques:</p> <ol> <li>use the arguments as a placholder forthe in function variables</li> <li>don't use new Array(),push(),concat() if not needed</li> <li>place "(){};," only when needed.</li> <li>use a,b,c,d... in short functions.</li> </ol> <p>so if u want a function for this</p> <p>with start,end (range)</p> <pre><code>function range(a,b,c,d){d=[];c=b-a+1;while(c--)d[c]=b--;return d} </code></pre> <p>so now range(3,7) returns [3,4,5,6,7]</p> <p>u save bytes in many ways here and this function is also very fast as it does not use concat, push, new Array and it's made with a while --</p>

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