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Filtering in javascript

The simplest and the best way to filter an array is to extend the Array.prototype as described here:

if (!Array.prototype.filter) {
    Array.prototype.filter = function (func) {
        var len = this.length;
        if (typeof func != "function")
            throw new TypeError();

        var res = new Array();
        var thisp = arguments[1];
        for (var i = 0; i < len; i++) {
            if (i in this) {
                var val = this[i];
                if (func.call(thisp, val, i, this))
                    res.push(val);
            }
        }

        return res;
    };
}

Then let’s filter on titles, which start with “N”:

function startsWithN(element, index, array) {
  return element.toLowerCase().indexOf("n") == 0;
}

Then just perform the filtering:

 var filtered = dates.filter(startsWithN);

It is very pleasant while using jQuery tmpl.

$("#contactContainer").empty();
$("#contactTemplate").tmpl(filtered).appendTo("#contactContainer");
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