This content originally appeared on DEV Community and was authored by Dharshini E
Control Flow Statements :
1.What is Control Flow?
Control flow is the order in which JavaScript executes code. By default, it’s top-to-bottom. But with control flow statements, you can:
- Run a block of code only if a condition is true.
- Run code repeatedly using loops.
- Jump out of loops early or skip certain steps.
** Conditional Statements in JavaScript**
- if statement: Executes a block of code only when the condition is true. example:
let age = 20;
if (age >= 18) {
console.log("You are an adult.");
}
2.if else Statement:
Provides two different paths: one if the condition is true, another if it’s false.
example:
let age = 16;
if (age >= 18) {
console.log("You can vote.");
} else {
console.log("You are too young to vote.");
}
3.switch Statement:
A cleaner way to compare the same value with many cases.
example:
let day = 3;
switch (day) {
case 1:
console.log("Monday");
break;
case 2:
console.log("Tuesday");
break;
case 3:
console.log("Wednesday");
break;
default:
console.log("Other day");
}
Loops:
Loops let you repeat code until a condition is false.
1.for loop:
Runs a block of code a fixed number of times by using an initializer, condition, and increment/decrement.
example:
for (let i = 1; i <= 5; i++) {
console.log("Number " + i);
}
2.while loop:
Keeps running as long as the condition is true; checks the condition before each run.
example:
let i = 1;
while (i <= 5) {
console.log("Count: " + i);
i++;
}
3.do while loop:
Runs the block at least once, then repeats as long as the condition is true.
example:
let i = 1;
do {
console.log("Value is " + i);
i++;
} while (i <= 3);
This content originally appeared on DEV Community and was authored by Dharshini E
Dharshini E | Sciencx (2025-09-01T02:29:40+00:00) JavaScript – Control Flow Statements. Retrieved from https://www.scien.cx/2025/09/01/javascript-control-flow-statements/
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