How to use the pickAll function from ramda

ramda.pickAll is a function that returns a new object with only the specified properties from a source object, including undefined values for properties not present in the source object.

How does ramda.pickAll work?

ramda.pickAll is a function that takes a list of property names as its first argument and an object as its second argument. The function returns a new object that contains only the specified properties from the source object, including undefined values for properties not present in the source object.

Here's how ramda.pickAll works in detail:

1. The function first checks if the second argument is an object. If it's not, it immediately returns an empty object.
2. Next, it creates a new empty object that will be used to store the picked properties.
3. Then, it iterates over each property name in the list provided as the first argument.
4. For each property name, it checks if the property exists on the source object. If it does, it adds it to the new object with the same property name and value.
5. If the property does not exist on the source object, it adds it to the new object with an undefined value.
6. Finally, the function returns the new object containing only the specified properties.

Here's an example of how you could use ramda.pickAll to pick certain properties from an object:

javascriptCopy code
const R = require('ramda');

const sourceObj = { name: 'John', age: 30, occupation: 'Engineer' };
const pickedObj = R.pickAll(['name', 'occupation', 'salary'], sourceObj);

console.log(pickedObj); // Output: { name: 'John', occupation: 'Engineer', salary: undefined }

In this example, we're requiring the ramda package and importing the pickAll function from it.

We're then defining an object called sourceObj that has three properties: name, age, and occupation.

We're then calling R.pickAll with an array of property names to pick: ['name', 'occupation', 'salary'] and sourceObj as arguments. Since the salary property is not present in sourceObj, the new object returned by R.pickAll has an undefined value for the salary property.

Ai Example

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const R = require("ramda");

const sourceObj = { name: "John", age: 30, occupation: "Engineer" };
const pickedObj = R.pickAll(["name", "occupation", "salary"], sourceObj);

console.log(pickedObj); // Output: { name: 'John', occupation: 'Engineer', salary: undefined }

In this example, we're requiring the ramda package and importing the pickAll function from it. We're then defining an object called sourceObj that has three properties: name, age, and occupation. We're then calling R.pickAll with an array of property names to pick: ['name', 'occupation', 'salary'] and sourceObj as arguments. Since the salary property is not present in sourceObj, the new object returned by R.pickAll has an undefined value for the salary property. The output of console.log(pickedObj) is { name: 'John', occupation: 'Engineer', salary: undefined }.