JAVASCRIPT

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

Check if an array contains a number in javascript

const ratings = [1,2,3,4,5];

let result = ratings.includes(4); 
console.log(result); // true

result = ratings.includes(6); 
console.log(result); // false

js check if array contains value

var arr = ["name", "id"];
  if (arr.indexOf("name") > -1) console.log('yeah');
  else console.log('nah');

How do I check if an array includes a value in JavaScript?

Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE:

console.log(['joe', 'jane', 'mary'].includes('jane')); //true

check if array have "false" value using "includes"

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

check if array does not contain string js

function checkInput(input, words) {
 return words.some(word => input.toLowerCase().includes(word.toLowerCase()));
}

console.log(checkInput('"Definitely," he said in a matter-of-fact tone.', 
["matter", "definitely"]));

Check if an array contains a number in javascript

const ratings = [1,2,3,4,5];

let result = ratings.includes(4); 
console.log(result); // true

result = ratings.includes(6); 
console.log(result); // false

how to check if array contains an item javascript

let isInArray = arr.includes(valueToFind[, fromIndex])
// arr         - array we're inspecting
// valueToFind - value we're looking for
// fromIndex   - index from which the seach will start (defaults to 0 if left out)
// isInArray   - boolean value which tells us if arr contains valueToFind

js check if array contains value

return arrValues.indexOf('Sam') > -1

check if array does not contain string js

function checkInput(input, words) {
 return words.some(word => new RegExp(word, "i").test(input));
}

console.log(checkInput('"Definitely," he said in a matter-of-fact tone.', 
["matter", "definitely"]));

javascript - Determine whether an array contains a value

var contains = function(needle) {
    // Per spec, the way to identify NaN is that it is not equal to itself
    var findNaN = needle !== needle;
    var indexOf;

    if(!findNaN && typeof Array.prototype.indexOf === 'function') {
        indexOf = Array.prototype.indexOf;
    } else {
        indexOf = function(needle) {
            var i = -1, index = -1;

            for(i = 0; i < this.length; i++) {
                var item = this[i];

                if((findNaN && item !== item) || item === needle) {
                    index = i;
                    break;
                }
            }

            return index;
        };
    }

    return indexOf.call(this, needle) > -1;
};