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10 Things A JavaScript Developer Should Know

Updated: Mar 25, 2020

JavaScript is the single most important programming language used in contemporary software development. An estimated 95% of websitesuse JavaScript to introduce dynamic content to their visitors. Despite the importance of JavaScript for web and mobile development, many hiring managers do not know what to look for in a JavaScript developer. 

This guide will help executives interested in outsourcing JavaScript select the right outsourcing partner and software developers for their project.


There are two main types of scope in JavaScript: local scope and global scope. A solid understanding of code helps developers reduce the number of errors and create more readable code.

The term scope describes the visibility of variables, functions, and objects in a line of code during runtime. The principle is based on the idea that users should only have access to what they need at that time—and it represents The Principle of Least Access in practice. 

Software engineers should understand the difference between local scope and global scope. They should also be able to articulate which situations each access level is best for. Local scope refers to variables that can only be accessed by code inside of the function. On the other hand, global scope variables can be read and changed from anywhere in the code, regardless of the location of the variables.

Many novice developers do not understand the concept of scope and why it is so important for JavaScript development. Make sure to ask detailed questions about scope during the interview process. Alternatively, work with a JavaScript development service to create interview questions and screen candidates.

Control Flow

Control flow describes the order in which a computer executes a set of statements. This is a simple yet vital concept for JavaScript developers. 

Code typically runs in order from the first line to the last line. However, oftentimes scripts use conditional structures to change the way that code is executed. 

Take a standard website contact form, for example. When a visitor completes the form and clicks submit, the script submits their information and generates a confirmation note for the user. However, if the form is not complete, the conditional structure will generate a note that one or more fields are required.

This type of conditional structure is almost always required in JavaScript code and is what makes this language so extraordinary. Experienced developers must understand how JavaScript utilizes control flow to write error-free code and create interactive web applications that operate intuitively. 

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