How to use JavaScript Array unshift()

Array unshift() method

Program to use JavaScript Array unshift() method

let a = [8,10,12,14,16,18,20];
    let b = a.unshift(2,4,6);
    
    console.log(a);
    console.log(b);
    

Output

[
      2,  4,  6,  8, 10,
     12, 14, 16, 18, 20
    ]
    10
    

Steps Description

• Declare two variable a and b
• Initialize two variable with value of array a = [8,10,12,14,16,18,20] and b = a.unshift(2,4,6)
• Array unshift() method appends one or more elements to the beginning of an array and returns the length of the new array.
• The value of b variable is displayed with the help of console.log inbuilt function

Array unshift() method

Program to use JavaScript Array unshift() method

Program to use JavaScript Array unshift() method
    
    let c = [ 'Cat', 'Dog', 'Tiger', 'Lion'];
    let d = c.unshift('Elephant', 'Bear');
    
    console.log(c);
    console.log(d);
    

Output

[ 'Elephant', 'Bear', 'Cat', 'Dog', 'Tiger', 'Lion' ]
    

Steps Description

• Declare two variable c and d
• Initialize two variable with value of array c = [ ‘Cat’, ‘Dog’, ‘Tiger’, ‘Lion’] and d = c.unshift(‘Elephant’, ‘Bear’)
• Array unshift() method appends one or more elements to the beginning of an array and returns the length of the new array.
• The value of d variable is displayed with the help of console.log inbuilt function