JavaScript Basics

Data Types:

1. String - Sequence of characters. e.g. var x= "i love javascript" or var x='i love javascript'
2. Number - 6, 8.0. JavaScript uses floating points to represent numbers. e.g. var n=9.08
    Range: When decimal point is defined: -2e53 to 2e53. When decimal point is defined: -2e31 to        2e31
3. Boolean - true or false. e.g. var happy = true
4. undefined - default value assigned to any variable. e.g.
    var grace;
    console.log(grace); //output will be undefined
5. null - value assigned to a variable by programmer.
    e.g. var frost = "snowy evening";
    var frost=null;
    console.log(frost); //outputs null.


Pattern Matching
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string has a 'match' function which takes 'pattern' as argument.

pattern can be defined in either of the 2 ways:

A. var patt= /woods/;
B. var patt = new RegExp('woods');

Lets see a complete example:

var  phrase = "whose woods these are, i think i know";

phrase.match(patt);