JavaScript vérifie si le tableau est vide
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
}var colors=undefined;
if(!colors?.length){
console.log("empty")
}else{
// I am not empty
}