Example 1: javascript array contains
var colors = ["red", "blue", "green"];
var hasRed = colors.includes("red");
var hasYellow = colors.includes("yellow");
Example 2: javascript array contains
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango");
Example 3: js array includes
[1, 2, 3].includes(2);
[1, 2, 3].includes(4);
[1, 2, 3].includes(3, 3);
[1, 2, 3].includes(3, -1);
[1, 2, NaN].includes(NaN);
Example 4: array includes
let storyWords = ['extremely', 'literally', 'actually', 'hi', 'bye', 'okay']
let unnecessaryWords = ['extremely', 'literally', 'actually' ];
let betterWords = storyWords.filter(function(word) {
return !unnecessaryWords.includes(word);
});
console.log(betterWords)
Example 5: js array contains
let fruits = ["Banana", "Orange", "Apple", "Mango"];
let do_contain = fruits.includes("Mango");
Example 6: 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");
}