how to check array empty or not code example

Example 1: javascript check if array is empty

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

Example 2: javascript check if array is not empty

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

Example 3: javascript check if array is empty

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

Example 4: javascript cehck if array is empty

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