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Lodash _.toPairs

Overview

lodash is a popular utility library for JavaScript that provides many useful functions for manipulating arrays, objects, and other data structures. The _.toPairs function is one such function that is used to convert an object into an array of key-value pairs.

The _.toPairs function accepts an object as its parameter, and returns an array of arrays, where each sub-array contains two elements: the key and the value of a property of the original object. Here's an example of how to use _.toPairs:

const obj = { a: 1, b: 2, c: 3 };
const pairs = _.toPairs(obj);
console.log(pairs); // outputs [["a", 1], ["b", 2], ["c", 3]]

As you can see, the _.toPairs function returns an array of arrays, where each sub-array represents a key-value pair of the original object.

The _.toPairs function can be especially useful when you need to iterate over the properties of an object using a forEach or map function, since arrays are much easier to work with than objects.

In addition to _.toPairs, lodash also provides a related function called _.fromPairs, which does the reverse of _.toPairs, i.e., it converts an array of key-value pairs into an object. Here's an example of how to use _.fromPairs:

const pairs = [["a", 1], ["b", 2], ["c", 3]];
const obj = _.fromPairs(pairs);
console.log(obj); // outputs { a: 1, b: 2, c: 3 }

As you can see, the _.fromPairs function takes an array of arrays (each sub-array representing a key-value pair) and returns an object.

Overall, the _.toPairs function is a simple but powerful utility function that can be used to convert an object into an array of key-value pairs, making it easier to work with the properties of an object.