Highlights of JavaScript — Math Expressions and Prompts

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.

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