javascript prepend string to array
const names = ["Bob", "Cassandra"]
names.unshift("Alex")
names === ["Alex", "Bob", "Cassandra"]javascript prepend string to array
const names = ["Bob", "Cassandra"]
names.unshift("Alex")
names === ["Alex", "Bob", "Cassandra"]prepend to array javascript
// Build an array of test data.
var data = [ "X" ];
// Unshift data onto the array. Unshift() prepends elements to
// the beginning of the given array. Note that it can take more
// than one argument. In the output, notice that when unshift()
// takes multiple arguments, they are prepended in a right-to-left
// order (mimicing their appearence in the arguments list).
data.unshift( "A" );
data.unshift( "B", "C" );
// Output resultant array.
console.log( data );unshift method in javascript
var name = [ "john" ];
name.unshift( "charlie" );
name.unshift( "joseph", "Jane" );
console.log(name);
//Output will be
[" joseph "," Jane ", " charlie ", " john "]insert element at beginning of array javascript
// Use unshift method if you don't mind mutating issue
// If you want to avoid mutating issue
const array = [3, 2, 1]
const newFirstElement = 4
const newArray = [newFirstElement].concat(array) // [ 4, 3, 2, 1 ]
console.log(newArray);prepend to js array
var a = [1, 2, 3, 4];
a.unshift(0);
a; // => [0, 1, 2, 3, 4]Copyright © 2021 Codeinu
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