how to check if an array has a value 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: javascript array contains
var colors = ["red", "blue", "green"];
var hasRed = colors.includes("red"); //true
var hasYellow = colors.includes("yellow"); //false
Example 3: javascript element in array
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango");
Example 4: javascript check if in array
var extensions = ["image/jpeg","image/png","image/gif"];
if(extensions.indexOf("myfiletype") === -1){
alert("Image must be .png, .jpg or .gif");
}
Example 5: see if array contains array javascript
const found = arr1.some(r=> arr2.indexOf(r) >= 0)