check is array js code example

Example 1: javascript check if is array

var colors=["red","green","blue"];

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

Example 2: js check if array

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

Example 3: js check if is array

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

Example 4: how to check if something is array javascript

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

Example 5: 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

Example 6: 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");
}