add forEach test and implementation b00tc4mp#160

staff/manuel-barzi/playground/arrays/Array.prototype.forEach.js

@@ -0,0 +1,25 @@
+console.log('TEST Array.prototype.forEach')
+
+console.log('CASE print characters in array')
+
+var chars = ['a', 'b', 'c']
+
+// chars.forEach(function (element) { console.log(element) })
+// Expected output: "a"
+// Expected output: "b"
+// Expected output: "c"
+
+var printElement = function (element) { console.log(element) }
+
+chars.forEach(printElement)
+
+console.log('CASE sum numbers from array')
+
+var nums = [100, 200, 300]
+var result = 0
+
+nums.forEach(function (num) {
+    result += num
+})
+console.log(result)
+// 600

staff/manuel-barzi/playground/iterables/forEach.1.js

@@ -0,0 +1,24 @@
+var forEach = function (iterable, callback) {
+    for (var i = 0; i < iterable.length; i++) {
+        var element = iterable[i]
+
+        callback(element)
+    }
+}
+
+console.log('TEST Array.prototype.forEach')
+
+console.log('CASE print characters in iterable')
+
+var chars = { 0: 'a', 1: 'b', 2: 'c', length: 3 }
+
+// forEach(chars, function (element) { console.log(element) })
+// Expected output: "a"
+// Expected output: "b"
+// Expected output: "c"
+
+var printElement = function (element) {
+    console.log(element)
+}
+
+forEach(chars, printElement)

staff/manuel-barzi/playground/iterables/forEach.js

@@ -0,0 +1,35 @@
+var forEach = function (iterable, callback) {
+    for (var i = 0; i < iterable.length; i++) {
+        var element = iterable[i]
+
+        callback(element)
+    }
+}
+
+console.log('TEST Array.prototype.forEach')
+
+console.log('CASE print characters in iterable')
+
+var chars = { 0: 'a', 1: 'b', 2: 'c', length: 3 }
+
+// forEach(chars, function (element) { console.log(element) })
+// Expected output: "a"
+// Expected output: "b"
+// Expected output: "c"
+
+var printElement = function (element) {
+    console.log(element)
+}
+
+forEach(chars, printElement)
+
+console.log('CASE sum numbers from iterable')
+
+var nums = { 0: 100, 1: 200, 2: 300, length: 3 }
+var result = 0
+
+forEach(nums, function (num) {
+    result += num
+})
+console.log(result)
+// 600

staff/manuel-barzi/playground/raids/Raid.prototype.forEach.js

@@ -0,0 +1,45 @@
+var Raid = function () { this.length = 0 }
+
+Raid.prototype.forEach = function (callback) {
+    for (var i = 0; i < this.length; i++) {
+        var element = this[i]
+
+        callback(element)
+    }
+}
+
+console.log('TEST Array.prototype.forEach')
+
+console.log('CASE print characters in iterable')
+
+var chars = new Raid
+chars[0] = 'a'
+chars[1] = 'b'
+chars[2] = 'c'
+chars.length = 3
+
+// forEach(chars, function (element) { console.log(element) })
+// Expected output: "a"
+// Expected output: "b"
+// Expected output: "c"
+
+var printElement = function (element) {
+    console.log(element)
+}
+
+chars.forEach(printElement)
+
+console.log('CASE sum numbers from iterable')
+
+var nums = new Raid
+nums[0] = 100
+nums[1] = 200
+nums[2] = 300
+nums.length = 3
+var result = 0
+
+nums.forEach(function (num) {
+    result += num
+})
+console.log(result)
+// 600