JavaScript prüft, ob das Array leer ist
if (typeof array !== 'undefined' && array.length === 0) {
// the array is defined and has no elements
}
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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
}if (!Array.isArray(array) || !array.length) {
// array does not exist, is not an array, or is empty
// ⇒ do not attempt to process array
}