Category: JavaScript

Sometimes, we want to use the includes method in lodash to check if an object is in the collection with JavaScript.

In this article, we’ll look at how to use the includes method in lodash to check if an object is in the collection with JavaScript.

How to use the includes method in lodash to check if an object is in the collection with JavaScript?

To use the includes method in lodash to check if an object is in the collection with JavaScript, we can use the some function.

For instance, we write

const hasB = _.some([{ a: 1 }, { b: 2 }], { b: 2 });

to call some with the array [{ a: 1 }, { b: 2 }] that we want to check if { b: 2 } is in the array.

it should return true since { b: 2 } is in the array.

Conclusion

To use the includes method in lodash to check if an object is in the collection with JavaScript, we can use the some function.

Sometimes, we want to fix await is a reserved word error inside async function in JavaScript.

In this article, we’ll look at how to fix await is a reserved word error inside async function in JavaScript.

How to fix await is a reserved word error inside async function in JavaScript?

To fix await is a reserved word error inside async function in JavaScript, we can use await before the function that returns a promise.

For instance, we write

const sendVerificationEmail = () => async (dispatch) => {
  await Auth.sendEmailVerification();
  // ..
};

to call Auth.sendEmailVerification which returns a promise.

We use await to wait for the returned promise to finish before we run the rest of the code in the sendVerificationEmail function.

Conclusion

To fix await is a reserved word error inside async function in JavaScript, we can use await before the function that returns a promise.

Sometimes, we want to use Node.js to open default browser and navigate to a specific URL.

In this article, we’ll look at how to use Node.js to open default browser and navigate to a specific URL.

How to use Node.js to open default browser and navigate to a specific URL?

To use Node.js to open default browser and navigate to a specific URL, we can use the open package.

To install it, we run

npm install open

Then we use it by writing

const open = require("open");

open("http://example.com");
open("http://example.com", { app: "firefox" });

to call open to open the URL we pass into it.

We can also call it with an object that has some options.

We set app to 'firefox' to open the URL in Firefox.

Conclusion

To use Node.js to open default browser and navigate to a specific URL, we can use the open package.

Sometimes, we want to represent a binary number in JavaScript.

in this article, we’ll look at how to represent a binary number in JavaScript.

How to represent a binary number in JavaScript?

To represent a binary number in JavaScript, we can use the 0b prefix in our number.

For instance, we write

const bin = 0b1111;

to assign bin to the binary number 1111.

Conclusion

To represent a binary number in JavaScript, we can use the 0b prefix in our number.

Sometimes, we want to run asynchronous process inside a JavaScript for loop.

In this article, we’ll look at how to run asynchronous process inside a JavaScript for loop.

How to run asynchronous process inside a JavaScript for loop?

To run asynchronous process inside a JavaScript for loop, we can use async an await.

For instance, we write

const func = async () => {
  let i;
  let j = 10;
  for (i = 0; i < j; i++) {
    await asycronouseProcess();
    console.log(i);
  }
};

to create the func function that runs a for loop.

In it, we call asycronouseProcess which is a function that returns a promise.

We use await to wait for the promise to finish before continuing to the rest of the code in the loop.

Conclusion

To run asynchronous process inside a JavaScript for loop, we can use async an await.