javascript clear an array

let arr =["a","b","c"];
// ES6 way
const copy = [...arr];

// older method
const copy = Array.from(arr);arr = [];   // set array=[]

//function
const empty = arr => arr.length = 0;
//example
var arr= [1,2,3,4,5];
empty(arr) // arr=[]var cars = ["mazda","honda","tesla"];
	cars = []; // clear/empty the arraylet arr = [3.14, 7];

arr = [];//make sure there is no other reference