JavaScript Functions Tutorial: Parameters, Return Values & Syntax

Published: 28 February 2024
on channel: QA Thoughts

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Mastering Functions in JavaScript is the key to writing reusable, clean, and efficient code for test automation. In this tutorial, we break down exactly how functions work, how to "invoke" them, and the four main patterns you will use in your scripts.

If you are a beginner or a QA Engineer looking to strengthen your scripting skills, this guide covers everything from basic syntax to handling return values.

Topics Covered:
00:00 - Introduction: Why we need Functions?
00:15 - What is a Reusable Block of Code?
01:16 - Type 1: Function with No Parameter & No Return Value
02:03 - How to Call (Invoke) a Function
02:43 - Type 2: Function with No Parameter but Returns a Value
03:47 - Type 3: Function with Parameters (Arguments) & No Return
04:47 - Type 4: Function with Parameters & Return Value
05:45 - Summary of Function Execution

🛠️ Prerequisites:
To follow along, you will need:
Visual Studio Code (VS Code)
Node.js installed
Code Runner Extension (Recommended)

💡 Why is this important for QA?
In automation (Selenium, Playwright, Cypress), you will constantly create utility functions to handle repetitive tasks (like clicking buttons or parsing data). Understanding inputs (parameters) and outputs (return values) is mandatory for building a framework.

Connect with QA Thoughts:    / @qathoughts

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