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title 201.02 Reading Notes
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Class 02 Readings

Text

  • HTML uses graded headings (<h1> through <h6>) that default to decreasing text sizes

  • Paragraphs (<p>) separate text, and new paragraphs will begin on a new line. Text within can be bolded (<b>), italicized (<i>) and further styled with tags around specific text (following standard element rules) (see Duckett on HTML p 45-48)

  • Browsers use white space collapsing to display 1 space when 2+ are continuous in code

  • Content management systems may add markup automatically to pasted text-- plain text editors can serve as a "clean" copy source to avoid this

  • Semantic Markup: Used to describe or communicate about content for data or other programmatic interpretation rather than user view (eg: <cite>;<strong>)

CSS (see also 102 Reading Notes)

  • Cascading Style Sheets: controls visuals of content and text

  • Inline (selectors w/ elements); Internal (<style> section for whole page); external (pulled from other file-- useful for templating, aids load times in some circumstances)

  • Cascading priority: Marked Important (!important); More Specific; Later

JavaScript (see also 102 Reading Notes)

  • Anatomy: Statements (individual instructions) separated by ;'s; Code Blocks separated by curled braces (which may contain multiple statements)

  • Comments: Use // for single-line, /* to */ for multi-line.

  • Variables named, stored data that may be recalled (short-term) or adjusted through statements

JavaScript Data Types (not exhaustive)

  • Numeric: can include integers, decimals,

  • String: text, indicated by closed quotes ('string' or "string"). No breaks in a string. Use escape characters (\) to safely use meaningful JS characters within a string.

  • Boolean: True or False

  • note: JS doesn't need data type specified when variables are declared

JS variable naming restrictions

  • Begins with letter, $, or _

  • Contains letters, $,_, and numbers. NO - or .

  • Keywords and reserved words can't be used

  • Case-sensitive

  • "camel case": capitalize only words after initial word in variable name

Arrays

  • Variable that stores multiple values (lists) separated by ,'s within brackets, like soup = [355, 'Chopped Mushrooms', False];

  • Declared like other variables

  • Can include various data types

  • Ordering: values accessed in left-right order (first position is position 0), like: tastyIngredient = soup[1];, including for adjustment or reassignment. "length" property is number of arrayed items (can be accessed with .length, like: soup.length)

Decisions & Loops (see also 102 Reading Notes)

  • Comparison operators evaluate a value for true or false Boolean: == (equality); != (inequality); === (strict equality requiring same data type); !== (strict inequality) > ; < ; >= (greater than/equal to); <= ;

  • Logical operators test one or more conditions until a Boolean result: && (logical And); || (logical Or); ! (logical Not)