i'm using regex test elements in array of arrays. if inner array doesn't follow desired format, i'd remove main/outer array. regex i'm using working correctly. not sure why isn't removing - can advise or offer edits resolve problem?
for (var = arr.length-1; i>0; i--) { var = /^\w+$/; var b = /^\w+$/; var c = /^\w+$/; var first = a.test(arr[i][0]); var second = b.test(arr[i][1]); var third = c.test(arr[i][2]); if ((!first) || (!second) || (!third)){ arr.splice(i,1); }
when cast splice method on array, length updated immediately. thus, in future iterations, jump on of members.
for example:
var arr = ['a','b','c','d','e','f','g'] for(var = 0; < arr.length; i++) { console.log(i, arr) if(i%2 === 0) { arr.splice(i, 1) // remove elements index } } console.log(arr) it output:
0 ["a", "b", "c", "d", "e", "f", "g"] 1 ["b", "c", "d", "e", "f", "g"] 2 ["b", "c", "d", "e", "f", "g"] 3 ["b", "c", "e", "f", "g"] 4 ["b", "c", "e", "f", "g"] ["b", "c", "e", "f"] my suggestion is, not modify array if still have iterate through it. use variable save it.
var arr = ['a','b','c','d','e','f','g'] var = [] for(var = 0; < arr.length; i++) { if(i%2) { another.push(arr[i]) // store elements odd index } } console.log(another) // ["b", "d", "f"] or go array.prototype.filter, simpler:
arr.filter(function(el, i) { return i%2 // store elements odd index }) it outputs:
["b", "d", "f"] 