[removed] take every nth Element of Array

Question

I get an Array with an unknown Number of data. But I only have an predefined amount of data to be shown/store. How can I take every nth Element of the initial Array and redu

Answer 1

Maybe one solution :

avoid filter because you don't want to loop over 10 000 elements ! just access them directly with a for loop !

 
var log = function(val){document.body.innerHTML+='

'+val+'

'} var oldArr = [0,1,2,3,4,5,6,7,8,9,10] var arr = []; var maxVal = 5; var delta = Math.floor( oldArr.length / maxVal ); // avoid filter because you don't want // to loop over 10000 elements ! // just access them directly with a for loop ! // | // V for (i = 0; i < oldArr.length; i=i+delta) { arr.push(oldArr[i]); } log('delta : ' + delta + ' length = ' + oldArr.length) ; log(arr);