JavaScript/Data structures

From DocForge

Strings [edit]

In Javascript, strings are formed by a paired single quite (') or double quote("). Strings are literal sections of text, with escape sequences possible.

Strings may be converted from any object, by using the toString property.

The following functions are of note:

• string.fromCharCode(...)
• string.charAt(pos)
• string.charCodeAt(pos)
• string.concat(string1, string 2, ...)
• string.indexOf(searchString, positiion), string.lastIndexOf(searchString, positiion)
• string.match(regexp)
• string.replace
• string.slice (start, end), string.substring (start, end)
• string.split (delimitor, max)
• string.toLowerCase(), string.toUpperCase(), string.toLocaleLowerCase(), string.toLocaleUpperCase()
• string.trim()
• string.length

The following functions are used for converting strings to or from numbers:

• string.toNumber ()
• parseInt(string, radix)
• parseFloat(string)
• string.toString(radix)

Arrays [edit]

Defining an array can be done in the following methods:

var foo = new Array();
 
var foo = ["1", "2", "3"];

Arrays have the following properties:

length

Arrays have the following methods:

concat	Joins two or more arrays, returning one array
join(delimiter)	Joins elements of an array into a string, with the parameter providing the delimiter (default: ",")
pop	Removes and returns last element in the array.
shift	Removes and returns first element in the array.
push	Adds the element to the end of the array.
unshift	Adds the element to the front of the array
reverse	Reverses the order of the array.
slice(begin, end)	Returns a segment of the array.
splice	Adds and/or removes elements from the array.

Objects [edit]

JavaScript supports prototype-based object oriented programming, meaning objects are cloned and not pre-defined using classes.

Objects can be instantiated using a very simple syntax:

var bar = {};   // An empty object
var bar = {one: 1, two: "Two"};