JAVASCRIPT

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

js is array

Array.isArray([1, 2, 3]);   // true
Array.isArray({toto: 123}); // false
Array.isArray("tototruc");  // false
Array.isArray(undefined);   // false

js check if is array

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

javascript Array.isArray

// all following calls return true
Array.isArray([]);
Array.isArray([1]);
Array.isArray(new Array());
Array.isArray(new Array('a', 'b', 'c', 'd'));
Array.isArray(new Array(3));
// Little known fact: Array.prototype itself is an array:
Array.isArray(Array.prototype);

// all following calls return false
Array.isArray();
Array.isArray({});
Array.isArray(null);
Array.isArray(undefined);
Array.isArray(17);
Array.isArray('Array');
Array.isArray(true);
Array.isArray(false);
Array.isArray(new Uint8Array(32));
Array.isArray({ __proto__: Array.prototype });

check if is array javascript

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