StackOverflow2013

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plurals

PO
primarykey
Id
16903451
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-06-03T18:32:10.657
FavoriteCount
0
LastActivityDate
2018-07-09T00:53:25.727
LastEditDate
2018-07-09T00:53:25.727
LastEditorUserId
5411817
OwnerUserId
2450730
ParentId
6299500
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
while-- is the way to go <pre><code>var a=[],b=10;while(b--)a[b]=b+1 </code></pre> returns [1,2,3,4,5,6,7,8,9,10] explained with start & length <pre><code>var array=[],length=20,start=5;while(length--)array[length]=length+start </code></pre> returns [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24] want range? explained with start & end <pre><code>var array=[],end=30,start=25,a=end-start+1;while(a--)array[a]=end-- </code></pre> returns [25, 26, 27, 28, 29, 30] for -- <pre><code>for(var a=[],b=20;b>0;b--,a[b]=b+1) </code></pre> for++ <pre><code>for(var a=[],b=0;b<20;b++,a[b]=b+1) </code></pre> WHY is this theway to go? <ol> <li>while -- is prolly the fastest loop;</li> <li>direct setting is faster than push & concat;</li> <li>[] is also faster than new Array(10);</li> <li>it's not much longer code than all the others</li> </ol> byte saving techniques: <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> so if u want a function for this with start,end (range) <pre><code>function range(a,b,c,d){d=[];c=b-a+1;while(c--)d[c]=b--;return d} </code></pre> so now range(3,7) returns [3,4,5,6,7] 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 --
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1. This table or related slice is empty.
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1. POTersest way to create an array of integers from 1..20 in JavaScript
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1. PTAnswer
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1. UScocco
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1. VO
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