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TypeScript | Array unshift() Method
  • Last Updated : 18 Jun, 2020

The Array.unshift() is an inbuilt TypeScript function which is used to add one or more elements to the beginning of an array and returns the new length of the array. 
 Syntax:

array.unshift( element1, ..., elementN )

Parameter: This method accept n number of similar elements.

  • element1, …, elementN : This parameter is the elements to add to the front of the array.

Return Value: This method returns the length of the new array. 
Below example illustrate the  String unshift() method in TypeScriptJS:

Example 1: 

JavaScript






<script>
    // Driver code
    var arr = [ 11, 89, 23, 7, 98 ]; 
  
    // use of unshift() method 
    var tring= arr.unshift(11);
       
    // printing
    console.log( tring);
</script>

Output: 

6

Example 2: 

JavaScript




<script>
    // Driver code
    var arr = ["G", "e", "e", "k", "s", "f", "o",
               "r", "g", "e", "e", "k", "s"]; 
    var val;
   
    // use of unshift() method 
    val = arr.unshift("f");
    console.log( val );
    console.log( arr );
</script>

Output: 

14
["f","G","e","e","k","s","f","o","r","g","e","e","k","s"]



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