I am trying to check for an object property, but I can't understand why the second option returns false. Could anyone explain? Also, are there any other better ways to check properties?
let question = {
category: 'test'
}
console.log(question.hasOwnProperty('category')); // true
this wont work
let question = {
category: 'test'
}
console.log(question.hasOwnProperty(question.category)); // false
const obj = {
foo: 'bar',
};
// Check if an object has a certain key somewhere
console.log('foo' in obj);
console.log(!!obj['foo']);
console.log(obj.hasOwnProperty('foo'))
// Check if an object has a certain value somewhere
console.log(Object.values(obj).includes('bar'));In this line:
question.hasOwnProperty(question.category)
The part question.category returns 'test' and you haven't 'test' like property, just leave it like that:
question.hasOwnProperty(category)
You can also check property using:
'category' in question