Tutorial 1.1 JavaScript Data Types
Data Types: Numbers, Strings and Booleans. I'll post a link to a document which will summarise the 1.0 tutorials.
Number type, used for counting and calculations, keeping track of how many times a visitor has visited a website, specifying pixel locations of elements, how many products a customer wishes to purchase etc. In javascript, numbers exist as the character 3, which is three. They can also exist as fractional values, 3.5 . Javascript can also deal with negative values.
Strings, are a series of characters. A sentence like "How are you?" is known as a string in the javascript language. Strings are used for displaying user input, a status of a server (with Ajax) to let the user know the status of a transaction, or shopping cart and so forth.
To designate to the JS interpreter that a string is to exist, is by surrounding the string with quotation marks "" eg. "how are you?". You can either use single or double quotation marks, however base your decision around the content of the string. For example, "it's a lovely day", requires double quotation marks since the word it is follow by 's (it's). A string finishes with what it started with. If double quotation marks start at the beginning of the string, then double marks must be at the end of the string. The interpreter will detect this 'it's a nice day' as an error. Since it has begun with a single mark, while single quotation mark is between the (it) and (s). I hope that makes sense.
Boolean values are very simple. They consist of either a true or false statement. An example of this is, 1 + 1 = 3 . That statement would be false. Furthermore, 1 + 2 = 3 is true. Boolean values, are used to determine whether two functions interacting with each other, either equal a true or false statement. Sally will go to the shop (function 1), = Sally went to the shop (function 2) True.