JavaScript Array shift() Method

Below is the example of Array shift() method.

• Example:
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  <script> function func() {             // Original array      var array = ["GFG", "Geeks", "for", "Geeks"];         // Checking for condition in array      var value = array.shift();         document.write(value);     document.write("<br />");      document.write(array);  }     func(); </script>

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• Output:

  GFG
  Geeks, for, Geeks

The arr.shift() method removes the first element of the array thus reducing the size of the original array by 1.

Syntax:

arr.shift()

Parameters: This method does not accept any parameter.

Return value: This function returns the removed first element of the array. If the array is empty then this function returns undefined.

Note: This function can also be used with other javascript objects that behave like the array.

Below examples illustrate the JavaScript Array shift() method:

• Example 1: In this example the shift() method removes the first element of the array, therefore it returns 34.

  var arr = [2, 5, 8, 1, 4];
  document.write(value);
  document.write(arr);
  

  Output:

  34
  234,567,4
  

• Example 2: In this example the shift() method tries to remove the first element of the array, but the array is empty, therefore it returns undefined.

  var arr = [];
  document.write(value);
  document.write(arr)
  

  Output:

  undefined

Code for the above method is provided below:

Program 1:

Output:

34
234,567,4

Program 2:

Output:

undefined

Supported Browsers: The browsers supported by JavaScript Array shift() method are listed below:

• Google Chrome
• Microsoft Edge
• Mozilla Firefox
• Safari
• Opera

HGaur

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