cferdinandi/array-find.html

## array-find.html
<!DOCTYPE html>
<html>
<head>
	<title>Array.find()</title>
</head>
<body>

	<script>
		//
		// IE9 Support
		//

		// if the Array.prototype.find() method does not exist
		if (!Array.prototype.find) {

			// create a new function with that name
			Array.prototype.find = function (callback) {

				// pass the callback into the Array.prototype.filter() method
				// it accepts the same arguments as Array.prototype.find()
				var matches = this.filter(callback);

				// if there are matches, return the first one
				if (matches.length) {
					return matches[0];
				}

				// otherwise, return undefined
				return undefined;

			};

		}


		//
		// IE6 Support
		//

		// if the Array.prototype.find() method does not exist
		if (!Array.prototype.find) {

			// create a new function with that name
			Array.prototype.find = function (callback) {

				// Loop through the array
				for (var i = 0; i < this.length; i++) {

					// Check if the current element matches
					var match = callback(this[i], i, this);

					// If the current element matches, return it
					if (match) {
						return this[i];
					}

				}

				// Otherwise, return undefined
				return undefined;

			};

		}
	</script>

</body>
</html>

## string-includes.html
<!DOCTYPE html>
<html>
<head>
	<title>String.includes()</title>
</head>
<body>

	<script>
		// if the String.prototype.includes() method does not exist
		if (!String.prototype.includes) {

			// create a new function with that name
			String.prototype.includes = function (search, pos) {

				// if a position was provided, use it
				// otherwise, use 0
				pos = pos || 0;

				// use the more backwards compatible String.indexOf() method to get the substring's index
				// check if that index is greater than -1 and return the result
				return this.indexOf(search, pos) > -1;

			};

		}
	</script>

</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Array.find()</title>
	</head>
	<body>

	<script>
	//
	// IE9 Support
	//

	// if the Array.prototype.find() method does not exist
	if (!Array.prototype.find) {

	// create a new function with that name
	Array.prototype.find = function (callback) {

	// pass the callback into the Array.prototype.filter() method
	// it accepts the same arguments as Array.prototype.find()
	var matches = this.filter(callback);

	// if there are matches, return the first one
	if (matches.length) {
	return matches[0];
	}

	// otherwise, return undefined
	return undefined;

	};

	}


	//
	// IE6 Support
	//

	// if the Array.prototype.find() method does not exist
	if (!Array.prototype.find) {

	// create a new function with that name
	Array.prototype.find = function (callback) {

	// Loop through the array
	for (var i = 0; i < this.length; i++) {

	// Check if the current element matches
	var match = callback(this[i], i, this);

	// If the current element matches, return it
	if (match) {
	return this[i];
	}

	}

	// Otherwise, return undefined
	return undefined;

	};

	}
	</script>

	</body>
	</html>