To check if the value assigned to variable is an array, use Array.isArray() method.
let var1 = [‘red','yellow','green']; Array.isArray(var1); // true
If the value is array, it will return true.
let var2 = { color1: 'red', color2: 'yellow', color3: 'green' } Array.isArray(var2); // false
if the value is not array, it will return false.
Remember array is a sub-type of an object. In our example, both var1 and var2 type is object.
typeof(var1); // "object" typeof(var2); //"object"
Array.isArray() method will tell you if the passed object is an array as described above.