Quick Reference
The for statement defines a block of code to be executed as long as a specified condition is true.
<!-- html element to place output -->
<p id="my_output"></p>The following loop will run until i = 5, outputting the numbers represented by i to the page.
// variable
let text = '';
// loop
for (let i = 0; i < 5; i++) {
text += i + '<br>';
}
// output to HTML element
document.getElementById('my_output').innerHTML = text;Output
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4Syntax
for (statement 1; statement 2; statement 3) {
code to be executed
}Parameters
| Parameter | Description |
|---|---|
| statement 1 | Executed before the code block starts (usually used to initialize a counter variable) |
| statement 2 | The condition for running the code block (if true the loop will start over again, if false the loop will end) |
| statement 3 | Executed after the code block starts (usually used to increment a counter variable) |
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)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.