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Lodash _.set

Overview

Lodash is a popular and widely used utility library for JavaScript that provides a variety of helpful and efficient functions for tasks such as manipulating arrays, objects, strings, and more. One of the most commonly used functions in Lodash is the _.set method.

The _.set method is used to set the value of a property of an object or an array. It takes three arguments:

  • The object or array to modify
  • The key or path of the property to set
  • The value to set

If the property doesn't exist, it is created. If any of the keys in the path don't exist, they are also created.

Here's some example usage of _.set:

const obj = {
  foo: {
    bar: 42
  }
};

// Setting a single property
_.set(obj, 'foo.bar', 'new value');
console.log(obj.foo.bar); // output: "new value"

// Creating a nested object
_.set(obj, 'foo.baz.qux', 'new nested value');
console.log(obj.foo.baz.qux); // output: "new nested value"

In this example, _.set was used to set the value of the foo.bar property of the obj object to "new value". It was also used to create a nested foo.baz.qux property and set its value to "new nested value".

_.set can also be used with arrays:

const arr = [1, 2, 3];

// Setting a value in an array
_.set(arr, '[1]', 'new value');
console.log(arr); // output: [1, "new value", 3]

// Creating an array element and setting its value
_.set(arr, '[3].foo.bar', 'new nested value');
console.log(arr); // output: [1, "new value", 3, {foo: {bar: "new nested value"}}]

In this example, _.set was used to set the value of the second element in the arr array to "new value". It was also used to create a new element in the array at index 3, and create a nested foo.bar property on that element and set its value to "new nested value".

_.set is a powerful and versatile method that can come in handy in many different scenarios when working with objects and arrays.