add reverse Raid method test and implementation b00tc4mp#160

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

@@ -0,0 +1,67 @@
+var Raid = function () { this.length = 0 }
+
+Raid.prototype.reverse = function () {
+    for (var i = 0; i < Math.floor(this.length / 2); i++) {
+        var element = this[i]
+        this[i] = this[this.length - 1 - i]
+        this[this.length - 1 - i] = element
+    }
+
+    return this
+}
+
+console.log('TEST reverse')
+
+console.log('CASE reverses iterable of 2 elements')
+
+var names = new Raid
+names[0] = 'Peter'
+names[1] = 'John'
+names.length = 2
+var reversed = names.reverse()
+console.log(reversed)
+// Raid { 0: 'John', 1: 'Peter', length: 2 }
+console.log(names === reversed)
+// true
+
+console.log('CASE reverses iterable of 3 elements')
+
+var names = new Raid
+names[0] = 'Peter'
+names[1] = 'John'
+names[2] = 'Annita'
+names.length = 3
+var reversed = names.reverse()
+console.log(reversed)
+// Raid { 0: 'Annita', 1: 'John', 2: 'Peter', length: 3 }
+console.log(names === reversed)
+// true
+
+console.log('CASE reverses iterable of 4 elements')
+
+var names = new Raid
+names[0] = 'Peter'
+names[1] = 'John'
+names[2] = 'Annita'
+names[3] = 'Mary'
+names.length = 4
+var reversed = names.reverse()
+console.log(reversed)
+// Raid { 0: 'Mary', 1: 'Annita', 2: 'John', 3: 'Peter', length: 4 }
+console.log(names === reversed)
+// true
+
+console.log('CASE reverses iterable of 5 elements')
+
+var names = new Raid
+names[0] = 'Peter'
+names[1] = 'John'
+names[2] = 'Annita'
+names[3] = 'Mary'
+names[4] = 'Oswald'
+names.length = 5
+var reversed = names.reverse()
+console.log(reversed)
+// Raid { 0: 'Oswald', 1: 'Mary', 2: 'Annita', 3: 'John', 4: 'Peter', length: 5 }
+console.log(names === reversed)
+// true