jquery reset an array code example

Example 1: javascript empty array

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

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

Example 2: javascript empty array

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