---
title: "4 JavaScript Concepts That Every Developer Should Know"
url: https://daily.dev/posts/4-javascript-concepts-that-every-developer-should-know-whm7kjtpr
source_url: https://javascript.plainenglish.io/4-javascript-concepts-that-every-developer-should-know-a20f0d4c9dd8
type: article
source: "JavaScript in Plain English"
published: 2021-11-01T07:15:39.171Z
updated: 2021-11-01T07:15:39.172Z
tags: ["javascript"]
reading_time: 3
upvotes: 315
comments: 14
language: en
---

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# 4 JavaScript Concepts That Every Developer Should Know

**[JavaScript in Plain English](https://daily.dev/sources/jsPlainEnglish)** · 3 min read · 315 upvotes · 14 comments

## Summary

In this post, I will discuss four of the most important JavaScript concepts. IIFE IIFE, aka, Immediately Invoked Function Expression, are JavaScript functions defined as expressions that are immediately invoked and executed as soon as they are defined. Scope Scope determines which variables you have (or do not have) access to in different contexts. Closures are helpful to employ when you would like to pass variables, arrays, or methods from an outer function to an inner function.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://javascript.plainenglish.io/4-javascript-concepts-that-every-developer-should-know-a20f0d4c9dd8>

## Community discussion

Top comments from developers on daily.dev.

**@alstonf** · 1 upvotes

> Thanks 👍 for sharing it helped a lot

**@mhbaando** · 0 upvotes

> yeah definitely true this concepts must know every js developer, thanks for sharing

**@miladtehrany** · 0 upvotes

> Thanks, it's beneficial

**@rfornal** · 0 upvotes

> Excellent beginner article.

**@sameech** · 0 upvotes

> Nice

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---

Tags: [#javascript](https://daily.dev/tags/javascript)

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