if on empty array doesn't work code example

Example 1: js how to check is array empty es6

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

Example 2: js check if array is empty

if (typeof image_array !== 'undefined' && image_array.length > 0) {
    // the array is defined and has at least one element
}