Highlights of JavaScript — Math Expressions and Prompts

To learn JavaScript, we must learn the basics.

To learn JavaScript, we must learn the basics.

In this article, we’ll look at the most basic parts of the JavaScript language.

Math Expressions

We should eliminate ambiguity with JavaScript math expressions.

For example, if we have:

let totalCost = 1 + 3 * 10;

then readers may be confused about which operation comes first.

JavaScript has precedence rules for operators. They generally follow the same rules as normal math.

However, we can make everyone’s lives easier by wrapping parentheses around expressions that have higher precedence.

For example, we can write:

let totalCost = 1 + (3 * 10);

then we wrap the expressions around the multiplication.

Now we know the multiplication operation comes first.

If we move the parentheses, then the operations would be done in a different order.

For instance, if we have:

let totalCost = (1 + 3) * 10;

then the addition is done before the multiplication.

javascript programming technology

Exercise from Eloquent JavaScript. Today, we will write a function that forms a chessboard. You can find the exercise in the Eloquent Javascript book (3rd edition, chapter 2; Program Structure). Write a program that creates a string that represents an 8×8 grid, using newline characters to separate lines. At each position of the grid there is either a space or a “#” character. The characters should form a chessboard.

One of the nice things about learning JavaScript these days is that there is a plethora of choices for writing and running JavaScript code. In this article, I’m going to describe a few of these environments and show you the environment I’ll be using in this series of articles.

To paraphrase the title of an old computer science textbook, “Algorithms + Data = Programs.” The first step in learning a programming language such as JavaScript is to learn what types of data the language can work with. The second step is to learn how to store that data in variables. In this article I’ll discuss the different types of data you can work with in a JavaScript program and how to create and use variables to store and manipulate that data.

Professor JavaScript is a JavaScript online learning courses YouTube Channel. Students can learn how to develop codes with JavaScript from basic to advanced levels through the online courses in this YouTube channel.

Async callbacks or promises. Introduction to JavaScript Async Programming