Javascript Course

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

What attribute makes a radio button or checkbox input selected?
checked="checked" selected="selected" disabled="disabled"
<input type="checkbox" name="a_name" value="value" checked="checked" />
What CSS value scales the background image to the largest size contained within the element?
repeat-x contain linear-gradient
#id {
What operator is used to determine the rest of the division of two numbers?
% * /
var rest8_7 = 8 % 7;
Indicate the PHP function that rounds a number up to the next highest integer.
floor() ceil() abs()
$nr = ceil(3.5);
echo $nr;        // 4
array_map and array_search in JavaScript

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