push allocated vs dynamic (v17)

Revision 17 of this benchmark created by tetra on

Description

is it usefull to pre-allocate the array by setting the last value first when assigning some values ?

Setup

var n=10000;
    var myArray = [];
    
    var typedArray = new Int32Array(10000);

Test runner

Ready to run.

Testing in
TestOps/sec
push
for (var i=0; i<n; i++) { myArray.push(i) }
ready
reverse writing
  var i=n;
  while (i--) { myArray[i] =i }  
ready
reverse writing, array allocated with Array constructor
  var i=n;
  while (i--) { myArray[i] =i }  
ready
typed array rev
for(i=n-1; i>=0; i--){
typedArray[i] =i
}
ready
typed array
for(i=0; i<n; i++){
   typedArray[i] =i
}
 
ready
for with direct write
for (var i=0; i<=n; i++) { myArray[i] = i }
ready
for with direct write rev
for (var i=n; i>=0; i--) { myArray[i] = i }
ready

Revisions

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