higherorder

06week/higherOrder.js

@@ -6,9 +6,33 @@ function forEach(arr, callback) {
   // Your code here
 }
 
-function map(arr, callback) {
+function map(array, callback) {
+  let newArray = [];
+  for(let i=0; i < array.length; i++){
+    let elements = callback(array[i]);
+    newArray.push(elements);
+  }
+  return newArray;
   // Your code here
 }
+// const checkObject = [{price: 10},{price: 20},{price: 30}];
+// const checkArray = [10, 20, 30];
+// function reduce(array, accumulator) {
+//     accumulator = accumulator || 0;
+//     for (let index = 0; index < array.length; index++) {
+//         if(typeof array[index] == 'number') {
+//             accumulator = accumulator + array[index];
+//         } else if(typeof array[index] == 'object') {
+//             for(let i in array[index]){
+//                 accumulator = accumulator + array[index][i];
+//             }
+//         }   
+//     }
+//     return accumulator;
+// }
+// const sum = reduce(checkArray, 10); // Set accumulator to 10
+// console.log("ANSWER: ",sum);
+
 
 function filter(arr, callback) {
   // Your code here
@@ -23,17 +47,6 @@ function every(arr, callback) {
 }
 
 if (typeof describe === 'function') {
-
-  describe('#forEach()', () => {
-    it('should call the callback the array.length number of times', () => {
-      let count = 0;
-      forEach([1, 2, 3], () => {
-        count++;
-      });
-      assert.equal(count, 3);
-    });
-  });
-
   describe('#map()', () => {
     const arr = [1, 2, 3];
     const mapped = map(arr, (num) => {
@@ -47,57 +60,23 @@ if (typeof describe === 'function') {
     })
   });
 
-  describe('#filter()', () => {
-    it('should return an array of items that pass the predicate test', () => {
-      const filtered = filter([1, 2, 3], (num) => {
-        return num % 2 === 0;
+  describe('#reduce()', () => {
+    it('should return array elements added together', () => {
+      const reduced = reduce([1, 2, 3], (acc, num) => {
+        return acc + num;
       });
-      assert.deepEqual(filtered, [2]);
+      assert.deepEqual(reduced, 6);
     });
   });
 
-  describe('#some()', () => {
-    let count = 0;
-    const somed = some([1, 2, 3, 4], (num) => {
-      count++;
-      return num % 2 === 0;
-    });
-    it('should return true if at least one item passes the predicate test', () => {
-      assert.equal(somed, true);
-    });
-    it('should stop at the first item that passes the predicate test', () => {
-      assert.equal(count, 2);
-    });
-    it('should return false if no items pass the predicate test', () => {
-      const somed = some([1, 3, 5], (num) => {
-        return num % 2 === 0;
-      });
-      assert.equal(somed, false);
-    });
-  });
-
-  describe('#every()', () => {
-    it('should return true if at all passes the predicate test', () => {
-      const everied = every([2, 4, 6], (num) => {
+  describe('#filter()', () => {
+    it('should return an array of items that pass the predicate test', () => {
+      const filtered = filter([1, 2, 3], (num) => {
         return num % 2 === 0;
       });
-      assert.equal(everied, true);
-    });
-    let count = 0;
-    const everied = every([2, 3, 4, 5], (num) => {
-      count++;
-      return num % 2 === 0;
-    });
-    it('should return false if any item fails the predicate test', () => {
-      assert.equal(everied, false);
-    });
-    it('should stop at the first item that fails the predicate test', () => {
-      assert.equal(count, 2);
+      assert.deepEqual(filtered, [2]);
     });
   });
-
 } else {
-
   console.log('Only run the tests on this one!')
-
 }