Other methods like concat, map, and filter create a copy of the array ... As an example, this is what happens when you reverse an array. const languages = ["JavaScript", "TypeScript", "CoffeeScript"]; ...

JavaScript’s reduce is one of the most useful array methods that should ... we can recursively call the reduce function to flatten and then concatenate them with the final array.

When the concat method is called with zero or more arguments, // it returns an array containing the array elements of the // object followed by the array elements of each argument in order. // Arrays ...

Concatenation means to join items end to end. JavaScript offers the concat method for both strings and arrays that work in the same way. For arrays, the method is called on one, then another array is ...

JavaScript’s arrays can hold heterogeneous types, change size on the fly, and readily insert or remove elements. Traditional methods like slice, splice, and push/pop do this by operating on the ...