add support for typed arrays

https://codepen.io/kurkle/pen/jXEwYe

Author: kurkle

src/helpers/helpers.core.js

@@ -32,13 +32,20 @@ var helpers = {
 	},
 
 	/**
-	 * Returns true if `value` is an array, else returns false.
+	 * Returns true if `value` is an array (including typed arrays), else returns false.
 	 * @param {*} value - The value to test.
 	 * @returns {Boolean}
 	 * @function
 	 */
-	isArray: Array.isArray ? Array.isArray : function(value) {
-		return Object.prototype.toString.call(value) === '[object Array]';
+	isArray: function(value) {
+		if (Array.isArray && Array.isArray(value)) {
+			return true;
+		}
+		var type = Object.prototype.toString.call(value);
+		if (type.substr(0, 7) === '[object' && type.substr(-6) === 'Array]') {
+			return true;
+		}
+		return false;
 	},
 
 	/**

test/.eslintrc.yml

@@ -1,4 +1,8 @@
+parserOptions:
+  ecmaVersion: 5 # don't rely on default, since its changed by env: es6
+
 env:
+  es6: true # also changes default ecmaVersion to 6
   jasmine: true
 
 globals:

test/specs/helpers.core.tests.js

@@ -21,6 +21,15 @@ describe('Chart.helpers.core', function() {
 			expect(helpers.isArray([42])).toBeTruthy();
 			expect(helpers.isArray(new Array())).toBeTruthy();
 			expect(helpers.isArray(Array.prototype)).toBeTruthy();
+			expect(helpers.isArray(new Int8Array(2))).toBeTruthy();
+			expect(helpers.isArray(new Uint8Array())).toBeTruthy();
+			expect(helpers.isArray(new Uint8ClampedArray([128, 244]))).toBeTruthy();
+			expect(helpers.isArray(new Int16Array())).toBeTruthy();
+			expect(helpers.isArray(new Uint16Array())).toBeTruthy();
+			expect(helpers.isArray(new Int32Array())).toBeTruthy();
+			expect(helpers.isArray(new Uint32Array())).toBeTruthy();
+			expect(helpers.isArray(new Float32Array([1.2]))).toBeTruthy();
+			expect(helpers.isArray(new Float64Array([]))).toBeTruthy();
 		});
 		it('should return false if value is not an array', function() {
 			expect(helpers.isArray()).toBeFalsy();