refactor(ArrayMap): update ArrayMap to es2015 class (#3613)

lib/ArrayMap.js

@@ -2,49 +2,56 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
-function ArrayMap() {
-	this.keys = [];
-	this.values = [];
-}
-module.exports = ArrayMap;
 
-ArrayMap.prototype.get = function(key) {
-	for(var i = 0; i < this.keys.length; i++) {
-		if(this.keys[i] === key) {
-			return this.values[i];
+"use strict";
+
+class ArrayMap {
+	constructor() {
+		this.keys = [];
+		this.values = [];
+	}
+
+	get(key) {
+		for(let i = 0; i < this.keys.length; i++) {
+			if(this.keys[i] === key) {
+				return this.values[i];
+			}
 		}
+		return;
 	}
-	return;
-};
-
-ArrayMap.prototype.set = function(key, value) {
-	for(var i = 0; i < this.keys.length; i++) {
-		if(this.keys[i] === key) {
-			this.values[i] = value;
-			return this;
+
+	set(key, value) {
+		for(let i = 0; i < this.keys.length; i++) {
+			if(this.keys[i] === key) {
+				this.values[i] = value;
+				return this;
+			}
 		}
+		this.keys.push(key);
+		this.values.push(value);
+		return this;
 	}
-	this.keys.push(key);
-	this.values.push(value);
-	return this;
-};
-
-ArrayMap.prototype.remove = function(key) {
-	for(var i = 0; i < this.keys.length; i++) {
-		if(this.keys[i] === key) {
-			this.keys.splice(i, 1);
-			this.values.splice(i, 1);
-			return true;
+
+	remove(key) {
+		for(let i = 0; i < this.keys.length; i++) {
+			if(this.keys[i] === key) {
+				this.keys.splice(i, 1);
+				this.values.splice(i, 1);
+				return true;
+			}
 		}
+		return false;
 	}
-	return false;
-};
-
-ArrayMap.prototype.clone = function() {
-	var newMap = new ArrayMap();
-	for(var i = 0; i < this.keys.length; i++) {
-		newMap.keys.push(this.keys[i]);
-		newMap.values.push(this.values[i]);
+
+	clone() {
+		const newMap = new ArrayMap();
+
+		for(let i = 0; i < this.keys.length; i++) {
+			newMap.keys.push(this.keys[i]);
+			newMap.values.push(this.values[i]);
+		}
+		return newMap;
 	}
-	return newMap;
-};
+}
+
+module.exports = ArrayMap;