javascript declare empty array

const myArray1 = []
// or...
const myArray2 = new Array()

arr = [];   // set array=[]

//function
const empty = arr => arr.length = 0;
//example
var arr= [1,2,3,4,5];
empty(arr) // arr=[]

var colors = ["red","blue","green"];
    colors = []; //empty the array

var colors=[];
if(!colors.length){
	// I am empty
}else{
	// I am not empty
}

// Variable array for a wider scope:
var arrayName = [];
// Local scope variable array:
let arrayName = [];

let arrayName = [];

A = [];

if (array === undefined || array.length == 0) {
    // array empty or does not exist
}

let myArray = [12 , 222 , 1000 ];  
myArray.length = 0; // myArray will be equal to [].

var arr1 = ['a','b','c','d','e','f'];
var arr2 = arr1;  // Reference arr1 by another variable 
arr1 = [];
console.log(arr2); // Output ['a','b','c','d','e','f']