Modern JavaScript Features That Every Programmer Must Know..!

Modern JavaScript Features That Every Programmer Must Know..!

Modern JavaScript Features That Every Programmer Must Know..! JavaScript ES6 is the latest version available( as of 2021/June/1) since 2015. It's also known as ES6 and ECMAScript 2015. So many awesome every developer should know. When to use a function declaration vs. a function expression.

JavaScript ES6 is the latest version available( as of 2021/June/1) since 2015. It's also known as ES6 and ECMAScript 2015. So many awesome features were introduced with ES6, to make programmers work easy.

Here a list of some features that came with ES6. If you are looking for the full specification of ECMAScript 6 please visit from  here.

  • The let keyword
  • The const keyword
  • Array.find()
  • Array.findIndex()
  • New Number Methods
  • New Global Methods
  • JavaScript Modules
  • JavaScript Arrow Functions
  • JavaScript For/of
  • New Math Methods
  • New Number Properties
  • JavaScript Classes
  • JavaScript Promises
  • JavaScript Symbol
  • Default Parameters
  • Function Rest Parameter

That sure is a long list. So, today let's talk about some of the top features from this list.

  • The let keyword
  • The const keyword
  • JavaScript Arrow Functions
  • JavaScript Classes
  • Template literals
  • Freeze Objects
  • Destructuring
  • Promises

You can also read: Top JavaScript Frameworks For Developers .

const and let Keywords

Before ES6 there was only one way to declare variables in JS and that was with the var keyword. ES6 introduced let and const .

const and let works almost the same way. But with const you can declare constants(Read-only), so the variables declared as constants will be read-only. But this does not affect object properties or array elements.

When you declare a variable outside any function it's global scoped. It can be accessed from anywhere in the program. When a variable is declared inside a function it's said to be function scoped (ex: let and const).

javascript es6 js modern-javascript

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