how to use the __lookupsetter__ function from date-fns in javascript

The __lookupSetter__() function is a built-in function of the Object prototype in JavaScript. This function is used to return the setter function of a property.

The lookupSetter() function is a specific function available in the date-fns library, which provides a modular set of functions designed for efficient date manipulation. This function is used to get a setter function for a given object and property.

Here is an example usage of the lookupSetter() function from date-fns library:

index.tsx
const { lookupSetter } = require('date-fns');

const obj = {
  set foo(val) {
    console.log(`setting foo to ${val}`);
  }
};

const setterFoo = lookupSetter(obj, 'foo');

console.log(setterFoo); // Output: [Function: set foo]
228 chars
12 lines

In the above code, we first import the lookupSetter function from date-fns library. Then we create an object obj with a setter method for property foo. We then use the lookupSetter() function to get a reference of the setter function for foo property and store it in setterFoo variable. Finally, we log the setterFoo reference which logs the function as expected.

Note that lookupSetter() function returns the setter function reference for a given property, hence it only works with properties that have a setter.