JavaScript Loops
Loops are useful when you want to execute the same code repeatedly, each time with a different value.
This is often the case when working with arrays.
Instead of writing:
text += cars[0] + “<br>”;
text += cars[1] + “<br>”;
text += cars[2] + “<br>”;
text += cars[3] + “<br>”;
text += cars[4] + “<br>”;
text += cars[5] + “<br>”; |
You can write:
for (let i = 0; i < cars.length; i++) {
text += cars[i] + “<br>”;
} |
Different Kinds of Loops
JavaScript offers several types of loops:
- for: loops through a block of code a specified number of times.
- for/in: iterates over the properties of an object.
- for/of: loops through the values of an iterable object.
- while: executes a block of code as long as a specified condition is true.
- do/while: also runs a block of code while a specified condition is true, but guarantees at least one execution.
