Highlights of JavaScript — Conditional Statements

Highlights of JavaScript — Conditional Statements

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.

if Statements

If statements let us run code conditionally.

For example, we can write:

const answer = prompt("Where's the capital of Italy?");
if (answer === "Rome") {
  alert("Correct!");
}

to add a prompt to take in an answer to the question.

Then we check for it in th if statement. If answer is 'Rome' , then we show the 'Correct!' alert.

An if statement if followed by a boolean expression we’re checking for.

If the boolean expression returns true , then we run the code between the curly brace.

We should always use === to check for value equality since it checks for the type and value.

Simple if statements may be written without curtly brackets or the statement may be written all in one line.

But it’s more convenient to read to have the curly braces because it’s clearer.

Comparison Operators

The === operator is the comparison operator.

It’s the equality operator.

It’s used to compare 2 things to see if they’re equal.

We can use the equality operator to compare the return value of any 2 expressions.

For example, we can write:

if (totalCost === 81.50 + 100) {

or

if (fullName === firstName + " " + "wong") {

String comparisons are case-sensitive, so only if both cases are the same then the strings are considered the same.

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