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.

array.map()

The array.map(callback) 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 = arr.map((v, i)=>v*2);

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

array.indexOf()

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

HTML
CSS
JavaScript
PHP-MySQL
Which attribute indicates that an input field must be filled out before submitting?
required="required" autofocus="autofocus" placeholder="text"
<input type="text" name="name1" required="required" />
Which CSS method increases or decreases the size of the HTML element (including its content)?
translate() scale() skew()
#some_id:hover {
  transform: scale(2, 1.5);
  -ms-transform: scale(2, 1.5);    /* IE 9 */
  -moz-transform: scale(2, 1.5);   /* Firefox */
}
Click on the Date object method that returns the day of the month.
setDate() getMonth() getDate()
var rightnow = new Date();
var day = rightnow.getDate();
alert(day);
Which function is used to upload a file on server?
is_file() move_uploaded_file() fopen()
if(move_uploaded_file($_FILES["field_name"]["tmp_name"], "dir/file_name")) {
  echo "The file succesfully uploaded";
}
array_map and array_search in JavaScript

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