how to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}how to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}js check if object has property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: truecheck the properties of an object in javascript
for (var name in object) {
if (object.hasOwnProperty(name)) {
// do something with name
}
}
// OR
const hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => falsetest if property exists javascript
const hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => falsejavascript does object have property
var person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}check if object has method javascript
if(typeof myObj.prop2 === 'function') {
alert("It's a function");
} else if (typeof myObj.prop2 === 'undefined') {
alert("It's undefined");
} else {
alert("It's neither undefined nor a function. It's a " + typeof myObj.prop2);
}Copyright © 2021 Codeinu
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