1if (typeof array !== 'undefined' && array.length === 0) {
2    // the array is defined and has no elements
3}
4

1if(typeof array != 'undefined' && array.length > 0){
2	// array has elements
3}

1if (array && !array.length) {
2    // array is defined but has no element
3}

1var colors=[];
2if(!colors.length){
3	// I am empty
4}else{
5	// I am not empty
6}

1let myArray = [];
2
3if( myArray.length  > 0  ) {
4    console.log(myArray);
5    console.log("Array has elements");
6}
7else {
8    console.log("Array has no elements");
9}