javascript check if array only contains certain value no other code example

Example 1: check if array does not contain value javascript

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango"); // true

var n = fruits.includes("Django"); // false

Example 2: check if array have "false" value using "includes"

if (validation.includes(value)) {
    // ... your code
}