js check if empty array 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 empty
if (array && !array.length) {
// array is defined but has no element
}
Example 3: javascript not empty array not string
if (Array.isArray(array) && array.length) {
// array exists and is not empty
}
Example 4: check array empty or not in javascript
// To safely test if the array referenced by variable “array” isn’t empty:
if (array && array.length) {
// not empty
} else {
// empty
}
// Note that if “array” is assigned to some other object that isn’t an array, the code will still execute the “else” part.
// A possible improvement to check that the object is specifically an empty array might be this:
if (array && array.constructor === Array && array.length === 0) {
// strictly an empty array
} else {
// either null, or not an array or not an empty array
}