The array_map(), and array_search() functions are generally known and used in PHP. These functions are useful when working with arrays. JavaScript has similar functions, but with other syntax.

The method returns an array containing all the elements of array after applying the callback function to each one.
- Example:
var arr = [1, 4, 9, 16];

//creates an array with the values from arr, doubled
const arr2 =, i)=>v*2);

console.log(arr2); //[2, 8, 18, 32]


The JavaScript array.indexOf(value) method is equivalent to the php array_search(value, array) function, it searches the array for a given value and returns the corresponding index if successful, or -1 if none is found.
- Example:
let arr =['ab', 'cd', 90];
var ixv = arr.indexOf('cd');
if(ixv !=-1) document.write('<p>arr contains the value: cd, with index: '+ixv+'</p>');

Daily Test with Code Example

Which meta tag provides a short description of the page?
<meta content="..."> <meta description="..."> <meta http-equiv="...">
<meta name="description" content="70-160 characters that describes the content of the page" />
Which CSS property is used to stop the wrapping effect of the "float"?
clear text-align position
#some_id {
  clear: both;
Click on the method which gets an array with all the elements in the document that have a specified tag name.
getElementsByName() getElementById() getElementsByTagName()
var divs = document.getElementsByTagName("div");
var nr_divs = divs.length;
Indicate the PHP function which returns the number of elements in array.
is_[) count() strlen()
$arr =[7, 8, "abc", 10);
$nri = count($arr);
echo $nri;        // 4
array_map and array_search in JavaScript

Last accessed pages

  1. Get the value of the selected /checked checkboxes in a form (41480)
  2. Contact page - CoursesWeb (21842)
  3. Tabs effect with CSS (22547)
  4. Get and Modify content of an Iframe (18305)
  5. Making DIV Contents Scroll Horizontally, with multiple Div`s inside (28871)

Popular pages this month

  1. Making DIV Contents Scroll Horizontally, with multiple Div`s inside (1391)
  2. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (1361)
  3. Contact page - CoursesWeb (1342)
  4. Tabs effect with CSS (1342)
  5. Insert, Select and Update NULL value in MySQL (843)