JavaScript Reference
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Quick Reference

The Boolean prototype property allows you to add new properties and methods to existing booleans.

<!-- html element to place output -->
<p id="my_output"></p>
// variable
let x = true;

// add new method
Boolean.prototype.my_color = function() {
  	if (this.valueOf() == true) {
    	return 'red';
  	} else {
    	return 'blue';
  	}
};

//output to HTML element
document.getElementById('my_output').innerHTML = 'Color: ' + x.my_color();

Output

Color: red

Syntax

Boolean.prototype.name = value

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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