Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/javascript-control-flow-statements/ below:

JavaScript Control Flow Statements - GeeksforGeeks

Last Updated : 02 Aug, 2025

Control flow statements in JavaScript control the order in which code is executed. These statements allow you to make decisions, repeat tasks, and jump between parts of a program based on specific conditions.

The if statement executes a block of code only if a specified condition is true.

const age = 18;
if (age >= 18) {
    console.log("You are an adult.");
}

• Checks if age is greater than or equal to 18.
• Logs "You are an adult." if the condition is true.

The if...else statement provides an alternate block of code to execute if the condition is false.

const score = 40;
if (score >= 50) {
    console.log("You passed.");
} else {
    console.log("You failed.");
}

• It will log "You passed." if the score is 50 or more.
• Otherwise, logs "You failed."

The if...else if...else statement is used when you want to handle multiple conditions.

const temp = 25;
if (temp > 30) {
    console.log("It's hot.");
} else if (temp >= 20) {
    console.log("It's warm.");
} else {
    console.log("It's cold.");
}

• Checks if the temperature is greater than 30, logs "It's hot."
• If not, checks if it's between 20 and 30, logs "It's warm."
• Otherwise, logs "It's cold."

The switch statement evaluates an expression and executes a block of code based on matching cases. It provides an alternative to long if-else chain.

const day = "Monday";
switch (day) {
    case "Monday":
        console.log("Start of the week.");
        break;
    case "Friday":
        console.log("End of the workweek.");
        break;
    default:
        console.log("It's a regular day.");
}

Start of the week.

• Checks the value of day and matches it to a case.
• Logs "Start of the week." if day is "Monday".
• Logs "End of the workweek." if day is "Friday".
• Logs "It's a regular day." if no cases match.

In some programming languages, a ternary operator is used to assign a value to a variable based on a condition.

let a = 10;
console.log(a === 5 ? "a is equal to 5" : "a is not equal to 5");

Output

a is not equal to 5

• Variable Declaration: let a = 10; assigns 10 to variable a.
• Ternary Operator: a === 5 ? "a is equal to 5" : "a is not equal to 5"; checks if a is strictly equal to 5.
  • If true, it returns "a is equal to 5".
  • If false, it returns "a is not equal to 5".

Control flow statements are backbone in programming for

• Decision-Making: To execute specific blocks of code based on conditions (e.g., if, if...else).
• Branching: To exit loops or skip iterations (break, continue).
• Looping: To repeat tasks (for, while, do...while).
• Switching: To handle multiple conditions effectively (switch).

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4