JAVASCRIPT

if is array javascript

let names=['Jhon','David','Mark'];
console.log(Array.isArray(names));
// true

let user={id:1,name:'David'};
console.log(Array.isArray(user));
// false

let age 18;
console.log(Array.isArray(age));
// false

check if element is array javascript

Array.isArray([]) //true
Array.isArray({}) //false
Array.isArray('') //false
Array.isArray(null) //false

array value check javascript

const names = ["code","codepadding"]
const key = "codepadding";
var have = names.includes(key) // return true / false
if(have){
	//	do something
}

js check if array

Array.isArray([1, 2, 3]);	// true
Array.isArray('asdf');		// false

js check if is array

if(Array.isArray(colors)){
    //colors is an array
}

js test if array

if(Array.isArray(myVarToTest)) {
	// myVatToTest is an array
} else {
	// myVarToTest is not an array
}

javascript check if array

let variable1 = [2, 3]
let variable2 = "test";

variable1.constructor === Array; // true
variable2.constructor === Array; // false

how to check if array

// Check if something is an Array 
// just like you do with "typeof"
Array.isArray([1, 2, 3]);	// true
Array.isArray('asdf');		// false

how to check if something is array javascript

function isArray(value) {
    return Object.prototype.toString.call(value) === "[object Array]";
}

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");
} 

array check in javascript

const arr = ["name"]
console.log(Array.isArray(arr)); // true

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);

if array javascript

// I know javascript can be hard but see this example and you will learn

// Javascript if condition and array example
var people = ["filex", "alex", "jon"];
var peopleNeeded = people[1]; // 1 is the index bc the index starts from 0
 
if (peopleNeeded <= people[1]) {
 console.log("alex needed");   
} else {
 console.log("lol");   
}

check items in array javascript

function checkAllEven(arr) {
  return arr.every(function(x){
	 return	x % 2 === 0
	})
}

//using "every" to check every item in array.

check if is array javascript

if(Object.prototype.toString.call(someVar) === '[object Array]') {
    alert('Array!');
}