how to check if array has certain value code example
Example 1: how to check if item is in list js
var myList=["a", "b", "c"];
mylist.includes("d")//returns true or false
Example 2: 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");
}