Lab7 Arrays

.eslintrc.json

@@ -18,7 +18,7 @@
     ],
     "linebreak-style": [
       "error",
-      "unix"
+      "windows"
     ],
     "quotes": [
       "error",

Exercises/1-remove.js

@@ -1,7 +1,10 @@
 'use strict';
 
 const removeElement = (array, item) => {
-  // Remove item from array modifying original array
+  const index = array.indexOf(item);
+  if (index !== -1) array.splice(index, 1);
 };
-
+const array = [1, 2, 3, 4, 5, 6, 7];
+removeElement(array, 5);
+console.log(array);
 module.exports = { removeElement };

Exercises/2-elements.js

@@ -1,7 +1,12 @@
 'use strict';
 
 const removeElements = (array, ...items) => {
-  // Remove multiple items from array modifying original array
+  for (let i = 0; i < items.length; i++) {
+    const index = array.indexOf(items[i]);
+    if (index !== -1) array.splice(index, 1);
+  }
 };
-
+const array = ['Kiev', 'Beijing', 'Lima', 'Saratov'];
+removeElements(array, 'Lima', 'Berlin', 'Kiev');
+console.log(array);
 module.exports = { removeElements };

Exercises/3-unique.js

@@ -1,8 +1,14 @@
 'use strict';
 
-// Create and return a new array without duplicate elements
-// Don't modify initial array
-
-const unique = (array) => [];
-
+const unique = (array) => {
+  const result = [];
+  for (const str of array) {
+    if (!result.includes(str)) {
+      result.push(str);
+    }
+  }
+  return result;
+};
+const result = unique([2, 1, 1, 3, 2]);
+console.log(result);
 module.exports = { unique };

Exercises/4-difference.js

@@ -1,8 +1,15 @@
 '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 array = [];
+  for (let i = 0; i < array1.length; i++) {
+    const item = array1[i];
+    if (!array2.includes(item)) array.push(item);
+  }
+  return array;
+};
+const array1 = [7, -2, 10, 5, 0];
+const array2 = [0, 10];
+const result = difference(array1, array2);
+console.log(result);
 module.exports = { difference };