Array.isArray(array)
This does not work to test if its an array.
if (array) {
// empty arrays evaluate as false
}
if (array && array.length > 0) {
// you may still want to capture the array
}
const clone = array.slice(0);
const array = ['x', 'y', 'z'];
for (const key in array) {
console.log(key);
}
0
1
2
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
const array = ['x', 'y', 'z'];
for (const value of array) {
console.log(value);
}
x
y
z
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
Reuse Array:
array1.push(...array2);
New Array:
const array3 = array1.concat(array2);