Statements
A program is a sequence of statements executed one by one.
Syntax
statement1;
statement2;A JavaScript program is a list of statements. Statements are executed in the order they are written, from top to bottom.
Semicolons
Statements are separated by semicolons ;. It is good practice to end every statement with one.
Whitespace
JavaScript ignores extra spaces and blank lines, so you can format code to make it readable.
Example
Loading editor…
Press Run to execute the code.
When to use it
- Execute a series of DOM updates in sequence when a modal dialog opens.
- Chain variable declarations and assignments as discrete steps in an initialisation routine.
- Build a configuration object statement-by-statement before passing it to a third-party library.
More examples
Sequential variable statements
Runs three separate assignment statements in order to compute a final total with tax.
let total = 0;
total = total + 50;
total = total * 1.1;
console.log(total); // 55Derive a message from an array
Chains three statements to derive a count and build a message string from an array.
const items = ["apple", "banana", "cherry"];
const count = items.length;
const message = "You have " + count + " items.";
console.log(message);DOM manipulation statements
Executes four statements in sequence to select, style, and label a DOM element.
const box = document.getElementById("box");
box.style.background = "#0070f3";
box.style.color = "#fff";
box.textContent = "Active";
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