JavaScript Writing Clean and Modern Code

المعرفة:: JavaScript الحالة::مؤرشفة المراجع:: The Complete JavaScript Course 2022 From Zero to Expert

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Readable Code

• Write code so that others can understand it.
• Write code so that you can understand it in 1 year.
• Avoid too clever and over-complicated solutions.
• Use descriptive variable names: what they contain.
• Use descriptive function names: what they do.

General

• Use DRY principle (refactor your code).
• Don’t pollute global namespace, encapsulate instead.
• Don’t use var.
• Use strong type checks (- and !==).

Functions

• Generally, functions should do only one thing.
• Don’t use more than 3 function parameters.
• Use default parameters whenever possible.
• Generally, return same data type as received.
• Use arrow functions when they make code more readable.

OOP

• Use ES6 classes.
• Encapsulate data and don’t mutate it from outside the class.
• Implement method chaining.
• Do not use arrow functions as methods (in regular objects).

Avoid Nested Code

• Use early return (guard clauses).
• Use ternary (conditional) or logical operators instead of if.
• Use multiple if instead of if/else-if.
• Avoid for loops, use array methods instead.
• Avoid callback-based asynchronous APIs.

Asynchronous Code

• Consume promises with async/await for best readability.
• Whenever possible, run promises in parallel (Promise.all).
• Handle errors and promise rejections.