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Lodash _.pickBy


The lodash _.pickBy method is a powerful utility function that allows developers to create a new object with properties from a source object that match certain criteria. This method belongs to the Lodash utility library, which is a popular JavaScript library that provides convenient and performant functions to work with arrays, objects, and other data types.

The _.pickBy method accepts two arguments: the source object to pick properties from, and a predicate function that is invoked for each property of the source object. The predicate function is used to determine whether a property should be included in the result object.

The syntax of the _.pickBy method is as follows:

_.pickBy(object, [predicate=_.identity])

The object parameter is the source object that you want to pick properties from, and the optional predicate parameter is the function that tests whether a given property should be included in the result object. If predicate is not provided, _.identity is used as the default function.

Here is an example use case of the _.pickBy method:

const obj = {
  name: 'Alice',
  age: 25,
  city: 'New York',
  profession: 'Software Developer'

const picked = _.pickBy(obj, (value, key) => key.length === 3);

console.log(picked); // { name: 'Alice', age: 25 }

In this example, we have a source object obj with four properties, and we want to create a new object with properties whose keys have a length of 3. We use the _.pickBy method to achieve this and pass in a predicate function that checks whether the length of the current property key is 3. The result picked object only contains the name and age properties that meet this criteria.

In conclusion, the _.pickBy method is a useful function for picking properties from an object based on certain criteria. It can save developers a lot of time and effort when working with complex data structures.