JAVASCRIPT

check if a variable is array in javascript

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

check if is array js

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

in javascript check is is an array or not

Array.isArray(yourItem)

js check if is array

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

js check if a variable is an array

let fruit = 'apple';
let fruits = ["apple", "banana", "mango", "orange", "grapes"];

const isArray = (arr) => Array.isArray(arr);

console.log(isArray.(fruit)); //output - false
console.log(isArray.(fruits)); //output- true

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]";
}

Check if value is array

Method 1: Using the isArray method
Array.isArray(variableName)'

Method 2:
variable instanceof Array

Method 3:
variable.constructor === Array

check variable is array or not in javascript

// npm i is-js-array 
const { isJSArray } = require("is-js-array");
isJSArray([]); // true
isJSArray({}); // false

check if is array javascript

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