javascript - Array in a loop -

creating small application generate random numbers. see fiddle here.

having issue function generates numbers. there 3 variables control output. count of numbers in set/sequence, number of sets, , number limit generated number, max number.

i created 2 loops generate numbers in sets. inner loop creates set of numbers (an array), , outer loop adds set setarr, array.

so created 2 arrays. 1 hold current generated set temp, , 1 hold whole sets, setsarr.

inner loop creates set, , outer loop pushes created set setsarr. , before executing again empty temp array. goes on , on.

but doesn't work. must missing something. help?

function gen() {     var cols = document.getelementbyid("cols").value;     var sets = document.getelementbyid("sets").value;     var max = document.getelementbyid("max").value;      var setsarr = [];     var temp    = [];      (var = 0; < sets; i++) {         (var j = 0; j < cols; j++) {             var num = math.floor(math.random() * max);             temp.push(num);         }         setsarr.push(temp);         temp.length = 0;     }      console.log(setsarr); } 

when you're pushing temp array setsarr, not copied referenced. emptying empty array in setsarr. when pushing same array, setsarr[0] == setsarr[1]…

instead, create new array object on every iteration:

var setsarr = [];  (var = 0; < sets; i++) {     var temp = [];     (var j = 0; j < cols; j++) {         var num = math.floor(math.random() * max);         temp.push(num);     }     setsarr.push(temp); }