JavaScript Sprawdź, czy tablica jest pusta
if (typeof array !== 'undefined' && array.length === 0) {
// the array is defined and has no elements
}
Code Hero
if (typeof array !== 'undefined' && array.length === 0) {
// the array is defined and has no elements
}
if (array === undefined || array.length == 0) {
// array empty or does not exist
}
if (array && !array.length) {
// array is defined but has no element
}if (Array.isArray(array) && array.length) {
// array exists and is not empty
}if(typeof array != 'undefined' && array.length > 0){
// array has elements
}const isNotEmpty = arr => Array.isArray(arr) && arr.length > 0;
isNotEmpty([1, 2, 3]);
// Result: true