adding custom functions into Array.prototype

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While the potential for clashing with other bits o’ code the override a function on a prototype is still a risk, if you want to do this with modern versions of JavaScript, you can use the Object.defineProperty method, turning off the enumerable bit, e.g.

// functional sort
Object.defineProperty(Array.prototype, 'sortf', {
    value: function(compare) { return [].concat(this).sort(compare); }
});

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