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Programming with JavaScript

JavaScript make your web page more interactive by :

• you can access the content .
• you can modify the content
• program rules or instructions the browser can follow.
• react to events triggered by the user or browser .

  Html and css quieq refresher :

  Html element added to the content of page to describe the strcture . an element consist the opening , closing tags and the contant .

  css uses rules to indicate how the contents of one or more elements should be displayed in the browser .each rule contain selector and declaration

  tips to write the code

• defining a goal and designing the script .
• sketching out the tasks in a flowchart

  expression

  there are two type :

• expression that assign value to variable , which is doing using asignment operator (=).
• expression that use two or more values to return a single value .

  operators type

• assignment operator (=)
• arithmetic operator
• string operator (+)
• comparsion operator
• logical operator

declaring function

to creating function you need to give it name and some statment in curly braces to achive.

calling function

to run the code in curly braces , you use the function name followed by parentheses

declaring function that need information

when you declar function you give parameters . inside the function the parameters will be as variable . when you need to call this function you must spicified the values inside parentheses. this value called argument and it can be provide as value or variable.

you can get a single value out of function by return the result of the function