JavaScript Reference
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Quick Reference

The function statement declares a function to be executed later, when it is called. Functions are objects, and have both properties and methods.

<!-- html element to place output -->
<p id="my_output"></p>

The following creates a function that will output content to the page. But is will only do so once it is called in line 7.

// function
function my_function() {
    document.getElementById('my_output').innerHTML = 'Hello World';
}

// calling the function
my_function();

Output

Hello World

Syntax

function function_name(parameters) {
    code to be executed
}

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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