JAVASCRIPT

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 test if array

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

how to check if something is array javascript

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

array check in javascript

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

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!');
}