Natalia js iterators lab homework

index.js

@@ -7,27 +7,40 @@ var myReduce = require('./myEach');
   To run it on the console do: `node index.js`
 ***********************************************************************/
 
-var numArray = [0,1,10,100,1000];
+/* myEach */
 
+var numArray = [0,1,10,100,1000];
 
-/* myEach */
+function myEach(array, callback) {
+  for (var i = 0; i < array.length; i++) {
+    callback(array[i], i, array);
+  }
+}
 
 //
-// myEach(numArray, function print(element, index, arr) {
-//   console.log('inside myEach', element, index, arr);
-// });
+myEach(numArray, function print(element, index, arr) {
+  console.log('inside myEach', element, index, arr);
+});
 
 
+/* myMap */
+
+function myMap(arr, callback) {
+  var mappedArray = [];
+  for (var i = 0; i < arr.length; i++) {
+    mappedArray.push(callback(arr[i], i, arr));
+  }
+  return mappedArray;
+}
 
 
-/* myMap */
 
-// var input = ["a","b","c"];
-// var output = myMap(input, function capitalize(v){
-//     return v.toUpperCase();
-// });
-// console.log('Testing myMap')
-// console.log(output === ["A", "B", "C"]) // assertion
+var input = ["a","b","c"];
+var output = myMap(input, function capitalize(v){
+    return v.toUpperCase();
+});
+console.log('Testing myMap')
+console.log(output === ["A", "B", "C"]) // assertion
 
 
 console.log("the end");

myEach.js

@@ -1,9 +1,9 @@
 // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/ForEach
 
-function myEach(arr, callback) {
-
-//  CODE INSIDE HERE   //
-
+function myEach(array, callback) {
+  for (var i = 0; i < array.length; i++) {
+    callback(array[i], i, array);
+  }
 }
 
 /*

myMap.js

@@ -1,9 +1,11 @@
 // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Map
 
 function myMap(arr, callback) {
-
-//  CODE INSIDE HERE   //
-
+  var mappedArray = [];
+  for (var i = 0; i < arr.length; i++) {
+    mappedArray.push(callback(arr[i], i, arr));
+  }
+  return mappedArray;
 }
 
 /*

myReduce.js

@@ -1,11 +1,25 @@
 // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce for more details
 // Don't worry about initialValue at first. You can always add it in later.
 
-function myReduce(arr, callback) {
+function myReduce(arr, callback, initialValue) {
+  var i = 0;
+  var previousValue;
+
+  if (initialValue === undefined) {
+    i++;
+    previousValue = arr[0];
+  } else {
+    previousValue = initialValue;
+  }
+
+  for (; i < arr.length; i++) {
+    previousValue = callback(previousValue, arr[i], i, arr);
+  }
+  return previousValue;
+}
+
 
-//  CODE INSIDE HERE   //
 
-}
 
 /*
  Best if you don't code out here.