Working With The Node.js Assert Library

Working with the Node.js assert Library

In this post, we will give you information about Working with the Node.js assert Library. Here we will give you detail about Working with the Node.js assert Library – onlinecode And how to use it also give you a demo for it if it is necessary.

Node.js’ assert.equal(a, b) function will throw an error if a != b.
assert.equal(a, b) is equivalent assert(a, b).
Asserts are most commonly used for testing, but can also be used as a more concise alternative to an if statement in your code.

const assert = require('assert');

const a = 1;
const b = 2;
assert.equal(a, b); // Throws
assert(a, b); // Throws
assert.equal(a, a); // Succeeds
assert(a, a); // Succeeds

strictEqual()

While equal(a,b) throws an error if a != b, strictEqual(a, b) throws an error if a !== b.
Here’s more on the difference between !== and != in JavaScript

const assert = require('assert');

const a = 1;
const b = '1';

assert.equal(a, b); // Succeeds
assert.strictEqual(a, b); // Fails

deepEqual() && deepStrictEqual()

These functions do a deep comparison of objects to make sure they have the same keys and values.
Only use these functions with POJOs, this will not work with MongoDB ObjectIds.

const assert = require('assert');

const obj = { a: 1, b: 2, c: 3};
const pojo = { a: '1', b: '2', c: '3'};
const entry = { a: 1, b: 2, c: 3 };

assert.deepEqual(obj, pojo); // passes
assert.deepStrictEqual(obj, entry); // passes
assert.deepStrictEqual(obj, pojo); // fails

throws()

Use this function when you want to assert that the function you are testing should throw an error with a specific message.
The first parameter is a function and the second parameter is a regular expression that you want the error message to match.

const assert = require('assert');

function run() {
  assert.throws(() => { test(); }, /TypeError: Wrong Value/);
}

function test() {
  throw new TypeError('Wrong Value');
}

run();

rejects()

This functions similarly to throws(), but is used with promises.
Use this with async functions.

const assert = require('assert');

async function run() {
 await assert.rejects(async () => { await test(); }, /TypeError: Wrong Value/);
}

async function test() {
  throw new TypeError('Wrong Value')
}

run();

Node.js is an open-source, cross-platform JavaScript runtime environment. Node.js allows you to run JavaScript code outside of a web browser. This makes it possible to create a wide variety of applications, including web servers, real-time chat applications, and data processing pipelines for Working with the Node.js assert Library.

Node.js is built on top of the V8 JavaScript engine, which is also used by Google Chrome. This means that Node.js applications can take advantage of the same performance and features as Chrome.

Node.js is a popular choice for building web servers. This is because Node.js is very efficient at handling concurrent requests. Node.js uses a non-blocking event loop to handle requests, which means that it can handle multiple requests at the same time without slowing down.

Node.js is also a good choice for building real-time chat applications. This is because Node.js is able to push data to clients in real time without the need for polling. This makes it possible to create a smooth and responsive user experience.

Node.js is a powerful tool that can be used to create a wide variety of applications. If you are looking for a JavaScript runtime environment that is fast, scalable, and efficient, then Node.js is a great choice(Working with the Node.js assert Library).

Here are some of the benefits of using Node.js:

Performance: Node.js is very efficient at handling concurrent requests. This makes it a good choice for building web servers and real-time chat applications.
Scalability: Node.js is designed to scale horizontally. This means that you can add more nodes to your cluster to handle more traffic.
Efficiency: Node.js uses a non-blocking event loop to handle requests. This makes it possible to handle multiple requests at the same time without slowing down.
Community: Node.js has a large and active community. This means that there are many resources available to help you learn and use Node.js.

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