repo with tasks to practice HowProgrammingWorks#7

Author: Elena Kononchuk

Exercises/1-remove.js

@@ -1,7 +1,9 @@
-'use strict';
+"use strict";
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  return array.filter(function (x) {
+    return x != item;
+  });
 };
 
 module.exports = { removeElement };

Exercises/2-elements.js

@@ -1,7 +1,11 @@
-'use strict';
+"use strict";
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  for (const val of items) {
+    const index = array.indexOf(val);
+    if (index !== -1) array.splice(index, 1);
+  }
+  return array;
 };
 
 module.exports = { removeElements };

Exercises/3-unique.js

@@ -1,8 +1,17 @@
-'use strict';
+"use strict";
 
 // Create and return a new array without duplicate elements
 // Don't modify initial array
 
-const unique = (array) => [];
+const unique = (array) => {
+  //let unique = [...new Set(array)];
+  const newArray = [];
+  for (const item of array) {
+    if (!newArray.includes(item)) {
+      newArray.push(item);
+    }
+  }
+  return newArray;
+};
 
 module.exports = { unique };

Exercises/4-difference.js

@@ -1,8 +1,15 @@
-'use strict';
+"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 dif = [];
+  for (const item of array1) {
+    if (!array2.includes(item)) {
+      dif.push(item);
+    }
+  }
+  return dif;
+};
 module.exports = { difference };