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In general, a computer program is a list of "instructions" to be "executed" by a computer and these instructions are called statements.
In HTML, JavaScript programs are executed by the web browser.
JavaScript statements are composed of variables, values, operators, expressions, keywords, comments, etc.
These statements are executed one by one, as the same order as they are written.
The statements tells the browser what to do. For example, below statement tells the browser to write "Lynxsia IT Solutions" inside an HTML element with id="demo"
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Statement</h1>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = "Lynxsia IT Solutions";
</script>
</body>
</html>
Semicolons separate JavaScript statements. Add a semicolon at the end of each executable statement:
var a = 10;
var b = 10;
var c = a + b;
document.getElementById("demo").innerHTML = c;
/*
When separated by semicolons,
multiple statements on one line are allowed
*/
a = 5; b = 6; c = a + b;
JavaScript ignores multiple spaces. You can add white space to your script to make it more readable.
A good practice is to put spaces around operators ( = + - * / ):
let person = "Hege";
let person="Hege";
let x = y + z;
If a JavaScript statement does not fit on one line, the best place to break it is after an operator.
document.getElementById("demo").innerHTML =
"Lynxsia IT Solutions";
JavaScript statements can be grouped together in code blocks, inside curly brackets {...}.
The purpose of code blocks is to define statements to be executed together.
One place you will find statements grouped together in blocks, is in JavaScript functions.
function myFunction() {
document.getElementById("demo1").innerHTML = "Hello Dolly!";
document.getElementById("demo2").innerHTML = "How are you?";
}
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