javascript declare empty array

1arr = [];   // set array=[]
2
3//function
4const empty = arr => arr.length = 0;
5//example
6var arr= [1,2,3,4,5];
7empty(arr) // arr=[]

1var colors = ["red","blue","green"];
2    colors = []; //empty the array

1if (array === undefined || array.length == 0) {
2    // array empty or does not exist
3}

1const myArray1 = []
2// or...
3const myArray2 = new Array()

1Array.from({length: 500})
2
3// change the length to whatever value you want

1// Variable array for a wider scope:
2var arrayName = [];
3// Local scope variable array:
4let arrayName = [];