Check if specific object is empty in typescript
Solution 1:
Use Object.keys(obj).length to check if it is empty.
Output : 3
Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
Solution 2:
You can use Object.keys like this:
class Brand { }
const brand = new Brand();
if (Object.keys(brand).length === 0) {
console.log("No properties")
}If you want to check if the object has at least one non-null, non-undefined property:
- Get all the values of the object in an array using
Object.values() - Check if at least one of has value using
some
const hasValues =
(obj) => Object.values(obj).some(v => v !== null && typeof v !== "undefined")
class Brand { }
const brand = new Brand();
if (hasValues(brand)) {
console.log("This won't be logged")
}
brand.name = null;
if (hasValues(brand)) {
console.log("Still no")
}
brand.name = "Nike";
if (hasValues(brand)) {
console.log("This object has some non-null, non-undefined properties")
}Solution 3:
You can also use lodash for checking the object
if(_.isEmpty(this.brand)){
console.log("brand is empty")
}