JAVASCRIPT

get if there is a value in an array node js

myArray = Array(/*element1, element2, etc...*/);

// If the array 'myArray' contains the element 'valueWeSearch'
if(myArray.includes(valueWeSearch))
{
 	// Do something
}

how to check if an element is in an array javascript

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.includes("Mango");

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

how to check if item is in list js

var myList=["a", "b", "c"];
mylist.includes("d")//returns true or false

Check if the value exists in Array in Javascript

var army= ["Marcos", "DeltaForce", "Seals", "SWAT", "HeadHunters"];  
  
if(army.indexOf("Marcos") !== -1)  {  
  console.log("Yes, the value exists!")  
}else{  
  console.log("No, the value is absent.")  
}  

not in array js

!array.includes("element")

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

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

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");
} 

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 check if array is in array

var array = [1, 3],
    prizes = [[1, 3], [1, 4]],
    includes = prizes.some(a => array.every((v, i) => v === a[i]));

console.log(includes);

how to check if an element is in array javascript

array.includes('element that need to be checked') //returns true or false