util.js

"use strict";

Array.prototype.contains = function(x) { return this.indexOf(x) != -1; };
Array.prototype.pluck = function(prop) { return this.map(function(x) { return x[prop]; }); };

Array.prototype.forAdjacentPairs = function(callback, thisPtr) {
	var l = this.length;
	for (var i = 0, j = 1; j < l; i = j++) {
		var ti = this[i], tj = this[j];
		if(ti !== undefined && tj !== undefined)
			callback.call(thisPtr, ti, tj, i, j, this);
	}
};
Array.prototype.forEveryPair = function(callback, thisPtr) {
	var l = this.length;
	for(var i = 0; i < l; i++) {
		for(var j = i + 1; j < l; j++) {
			var ti = this[i], tj = this[j];
			if(ti !== undefined && tj !== undefined)
				callback.call(thisPtr, ti, tj, i, j, this);
		}
	}
};

Array.prototype.remove = function(element) {
	var l = this.length;
	for(var i = 0; i < l; i++) {
		if(this[i] == element) {
			this.splice(i, 1);
			return true;
		}
	}
	return false;
};

Object.values = function(obj) {
	var values = [];
	Object.forEach(obj, function(v) { values.push(v) });
	return values;
};
Object.size = function(obj) { var i = 0; for(var k in obj) ++i; return i; }
Object.reduce = function(obj, f, start, thisPtr) {
	var current = start || 0;
	for(var k in obj) {
		if(obj.hasOwnProperty(k)) {
			current = f.call(thisPtr, current, obj[k], k, obj)
		}
	}
	return current;
};
Object.forEach = function(obj, f, thisPtr) {
	for(var i in obj) {
		var oi = obj[i];
		if(oi !== undefined) {
			f.call(thisPtr, oi, i, obj);
		}
	}
};
Object.some = function(obj, f, thisPtr) {
	for(var i in obj) {
		var oi = obj[i];
		if(oi !== undefined && f.call(thisPtr, oi, i, obj) === true) {
			return true;
		}
	}
	return false;
};
Object.every = function(obj, f, thisPtr) {
	for(var i in obj) {
		var oi = obj[i];
		if(oi !== undefined && f.call(thisPtr, oi, i, obj) !== true) {
			return false;
		}
	}
	return true;
};
Object.forEachPair = function(obj, f, thisPtr) {
	for(var i in obj) {
		for(var j in obj) {
			var oi = obj[i], oj = obj[j];
			if(i < j && oi !== undefined && oj !== undefined) {
				f.call(thisPtr, oi, oj, i, j, obj);
			}
		}
	}
};
Object.isEmpty = function(obj) {
	for (var prop in obj) if (obj.hasOwnProperty(prop)) return false;
	return true;
};

function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}

var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
Date.prototype.timestamp = function() {
	return [
		this.getDate(),
		months[this.getMonth()],
		[
			pad(this.getHours()),
			pad(this.getMinutes()),
			pad(this.getSeconds())
		].join(':')
	].join(' ');
}