helmedeiros / javascript-roadtrip

Code School - JavaScript Road Trip helps you learn the basics of the JavaScript language

javascript-roadtrip

Code School - JavaScript Road Trip helps you learn the basics of the JavaScript language

Level 1 - The Cliffs of Value

Basic Operations

As any other language JavaScript has arithmetic operators. They are, as you can imagine, used to perform arithmetic between variables and/or values.

Operator	Description	Example	Result
+	Addition	3 + 2	5
-	Subtraction	3 - 2	1
*	Multiplication	3 * 2	6
/	Division	3 / 2	1.5
%	Modulus	3 % 2	1

Strings

Are the JavaScript way to handle, stores and process flat text. In order to signal to JavaScript that we want to process some flat text, we normally use a pair of quotations mark surrounding some text.

  var text = "Raindrops Keep Falling";
  console.log(text);

We can also use the addition(+) operator with strings, or string with numbers and expressions in a process called concatanation. Concatanation place strings together in one string.

  var text = "Raindrops Keep Falling";
  var text2 = "On My Head";
  console.log(text + text2);

Once we can need some quotations marks to be scaped, or even the backslash, we can use the characters need backlash.

  var text = "Raindrops Keep Falling \t ops";
  var text = "Raindrops Keep Falling \" ops";

Sometimes is also important to compare two or more strings. For that, javascript allow us to do that, in different forms, using the equal(=) operator.

Operator	Description	Example	Result
==	Exact equal	"a" == "a"	true
==	Exact equal	"a" == "A"	false
!=	Different	"a" != "a"	false
!=	Different	"a" != "A"	true

The String object has some properties and methods that could be helpull sometimes.

Property	Description	Example	Result
length	return string length	"abc".length	3