Exercises completed

Exercises/1-remove.js

@@ -1,7 +1,8 @@
 'use strict';
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  const index = array.indexOf(item);
+  index > -1 ? array.splice(index, 1) : array;
 };
 
 module.exports = { removeElement };

Exercises/2-elements.js

@@ -1,7 +1,10 @@
 'use strict';
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  for (const item of items) {
+    const index = array.indexOf(item);
+    index > -1 ? array.splice(index, 1) : array;
+  }
 };
 
 module.exports = { removeElements };

Exercises/3-unique.js

@@ -1,8 +1,11 @@
 'use strict';
 
-// Create and return a new array without duplicate elements
-// Don't modify initial array
-
-const unique = array => [];
+const unique = array => {
+  const newArray = [];
+  for (const item of array) {
+    !newArray.includes(item) ? newArray.push(item) : array;
+  }
+  return newArray;
+};
 
 module.exports = { unique };

Exercises/4-difference.js

@@ -1,8 +1,11 @@
 'use strict';
 
-// Find difference of two arrays
-// elements from array1 that are not includes in array2
-
-const difference = (array1, array2) => [];
+const difference = (array1, array2) => {
+  const newArray = [];
+  for (const item of array1) {
+    !array2.includes(item) ? newArray.push(item) : 0;
+  }
+  return newArray;
+};
 
 module.exports = { difference };