concat()

The concat() method in TypeScript joins two or more arrays into a new array without modifying the original ones.

Example

let arr1: string[] = [ 'hello' ];
let arr2: string[] = [ 'world' ];
let arr3: string[] = arr1.concat( arr2 );

console.log( arr3 ); // Output: ["hello", "world"]

In this example, arr1 and arr2 contain "hello" and "world", respectively. The concat() method merges them into a new array, arr3.