javascript check if value in array
var colors = ["red", "blue", "green"];
var hasRed = colors.includes("red"); //true
var hasYellow = colors.includes("yellow"); //falsevar fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango"); // true
var n = fruits.includes("Django"); // falsevar fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango");var myList=["a", "b", "c"];
mylist.includes("d")//returns true or falsevar fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango");
var extensions = ["image/jpeg","image/png","image/gif"];
if(extensions.indexOf("myfiletype") === -1){
alert("Image must be .png, .jpg or .gif");
}
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