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File: helpers.js
	// Removes duplicates from an array.
	function unique(array) {
		return array.filter(function(a){
			return !this[a] ? this[a] = true : false;
		}, {});
	}

	// Round a value to the closest 'to'.
	function closest ( value, to ) {
		return Math.round(value / to) * to;
	}

	// Current position of an element relative to the document.
	function offset ( elem ) {

	var rect = elem.getBoundingClientRect(),
		doc = elem.ownerDocument,
		docElem = doc.documentElement,
		pageOffset = getPageOffset();

		// getBoundingClientRect contains left scroll in Chrome on Android.
		// I haven't found a feature detection that proves this. Worst case
		// scenario on mis-match: the 'tap' feature on horizontal sliders breaks.
		if ( /webkit.*Chrome.*Mobile/i.test(navigator.userAgent) ) {
			pageOffset.x = 0;
		}

		return {
			top: rect.top + pageOffset.y - docElem.clientTop,
			left: rect.left + pageOffset.x - docElem.clientLeft
		};
	}

	// Checks whether a value is numerical.
	function isNumeric ( a ) {
		return typeof a === 'number' && !isNaN( a ) && isFinite( a );
	}

	// Rounds a number to 7 supported decimals.
	function accurateNumber( number ) {
		var p = Math.pow(10, 7);
		return Number((Math.round(number*p)/p).toFixed(7));
	}

	// Sets a class and removes it after [duration] ms.
	function addClassFor ( element, className, duration ) {
		addClass(element, className);
		setTimeout(function(){
			removeClass(element, className);
		}, duration);
	}

	// Limits a value to 0 - 100
	function limit ( a ) {
		return Math.max(Math.min(a, 100), 0);
	}

	// Wraps a variable as an array, if it isn't one yet.
	function asArray ( a ) {
		return Array.isArray(a) ? a : [a];
	}

	// Counts decimals
	function countDecimals ( numStr ) {
		var pieces = numStr.split(".");
		return pieces.length > 1 ? pieces[1].length : 0;
	}

	// http://youmightnotneedjquery.com/#add_class
	function addClass ( el, className ) {
		if ( el.classList ) {
			el.classList.add(className);
		} else {
			el.className += ' ' + className;
		}
	}

	// http://youmightnotneedjquery.com/#remove_class
	function removeClass ( el, className ) {
		if ( el.classList ) {
			el.classList.remove(className);
		} else {
			el.className = el.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
		}
	}

	// https://plainjs.com/javascript/attributes/adding-removing-and-testing-for-classes-9/
	function hasClass ( el, className ) {
		return el.classList ? el.classList.contains(className) : new RegExp('\\b' + className + '\\b').test(el.className);
	}

	// https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollY#Notes
	function getPageOffset ( ) {

		var supportPageOffset = window.pageXOffset !== undefined,
			isCSS1Compat = ((document.compatMode || "") === "CSS1Compat"),
			x = supportPageOffset ? window.pageXOffset : isCSS1Compat ? document.documentElement.scrollLeft : document.body.scrollLeft,
			y = supportPageOffset ? window.pageYOffset : isCSS1Compat ? document.documentElement.scrollTop : document.body.scrollTop;

		return {
			x: x,
			y: y
		};
	}

	// Shorthand for stopPropagation so we don't have to create a dynamic method
	function stopPropagation ( e ) {
		e.stopPropagation();
	}

	// todo
	function addCssPrefix(cssPrefix) {
		return function(className) {
			return cssPrefix + className;
		};
	}