Filter items in JavaScript Array using jQuery

Question

I have a JavaScript array as below which I need to filter to get the correct child values from the test data below.

var arrChildOptions2 = [
        {Parent:\'o         


        

Answer 1

array.filter() exists in vanilla JavaScript:

function isBigEnough(element) {
  return element >= 10;
}
var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
// filtered is [12, 130, 44]

That documentation page includes a polyfill for older browsers:

if (!Array.prototype.filter)
{
  Array.prototype.filter = function(fun /*, thisArg */)
  {
    "use strict";

    if (this === void 0 || this === null)
      throw new TypeError();

    var t = Object(this);
    var len = t.length >>> 0;
    if (typeof fun !== "function")
      throw new TypeError();

    var res = [];
    var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
    for (var i = 0; i < len; i++)
    {
      if (i in t)
      {
        var val = t[i];

        // NOTE: Technically this should Object.defineProperty at
        //       the next index, as push can be affected by
        //       properties on Object.prototype and Array.prototype.
        //       But that method's new, and collisions should be
        //       rare, so use the more-compatible alternative.
        if (fun.call(thisArg, val, i, t))
          res.push(val);
      }
    }

    return res;
  };
}

Answer 2

Yes try jquery grep, like this:

arr = jQuery.grep( JSON_ARRAY, index);

Answer 3

You might have more luck using the jQuery.grep() function rather than messing around with loops.

This function "Finds the elements of an array which satisfy a filter function. The original array is not affected".