Labs 1..4 done

Exercises/1-remove.js

@@ -1,7 +1,9 @@
 'use strict';
+// Remove item from array modifying original array
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  if (array.includes(item)) array.splice(array.indexOf(item), 1);
 };
 
 module.exports = { removeElement };
+

Exercises/2-elements.js

@@ -1,7 +1,10 @@
 'use strict';
+// Remove multiple items from array modifying original array
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  items.forEach(it => {
+    if (array.includes(it)) array.splice(array.indexOf(it), 1);
+  });
 };
 
 module.exports = { removeElements };

Exercises/3-unique.js

@@ -3,6 +3,10 @@
 // Create and return a new array without duplicate elements
 // Don't modify initial array
 
-const unique = array => [];
+const unique = array => {
+  const newArr = [];
+  array.forEach(x => { if (!newArr.includes(x)) newArr.push(x); });
+  return newArr;
+};
 
 module.exports = { unique };

Exercises/4-difference.js

@@ -3,6 +3,8 @@
 // Find difference of two arrays
 // elements from array1 that are not includes in array2
 
-const difference = (array1, array2) => [];
+const difference = (array1, array2) =>
+  //i'm here because of limit min, but may be it his wrong solution...
+  array1.filter(x => !array2.includes(x));
 
 module.exports = { difference };