- Tags: Conditional, JS Loop, JS Statement, Loop
- Categories: JavaScript Reference, JavaScript Statements, Reference
Quick Reference
The for…in statement loops over the properties of an object, executing a block of code inside the loop once for each item found.
<!-- html element to place output -->
<p id="my_output"></p>
The following loops through the array and outputs each item found, ending the loop after finding the final item.
// variables
let my_cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
let text = '';
// loop
for (let x in my_cars) {
text += my_cars[x] + " ";
}
// output to HTML element
document.getElementById('my_output').innerHTML = text;
Output
Lamborghini Ferrari Maserati Alfa Romeo
Syntax
for (x in object) {
code to be executed
}
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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