What are the loop structures in javascript?
There are three loop structures in JavaScript: for loop: repeatedly executes a block of code under given conditions for a known number of iterations. while loop: As long as the condition is true, the code block is executed repeatedly, used to perform iteration when the condition is met. do-while loop: Execute a block of code at least once, then check a condition and repeat the block of code as long as the condition is true.
Loop Structure in JavaScript
In JavaScript, the loop structure allows us to repeat a block of code a specified number of times . There are three main loop structures in JavaScript:
1. for loop
The for loop uses the following syntax:
<code>for (let i = 0; i < n; i++) { // 代码块 }</code>
-
let i = 0
: Declare a variablei
and initialize it to 0. -
i < n
: Loop condition, the loop will continue wheni
is less thann
. -
i
: After each iteration,i
will be incremented by 1.
2. while loop
while loop uses the following syntax:
<code>while (condition) { // 代码块 }</code>
-
condition
: loop condition, the loop will continue as long as the condition is true.
3. do-while loop
The do-while loop is similar to the while loop, but the code block is executed before the condition is checked. Its syntax is as follows:
<code>do { // 代码块 } while (condition);</code>
-
condition
: Loop condition, the loop will end when the condition is false.
Example
for loop:Print numbers 1 to 10
for (let i = 1; i <= 10; i++) { console.log(i); }
while loop:Print a random number until it is greater than 5
let randomNumber = Math.random(); while (randomNumber <= 0.5) { randomNumber = Math.random(); } console.log(randomNumber);
do-while loop: Print the numbers 1 to 3 at least once
let i = 0; do { i++; console.log(i); } while (i < 3);
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