Explain the unshift() method?

[vidushi-tomar-7f335103 (Vidushi Tomar)]

Explain the unshift() method ?

[sakshi-srivastava-f3c2a4a4 (Sakshi Srivastava)]

unshift method adds an element to the start of an array in JavaScript. The time complexity for the same is O(N) and it is not very efficient.