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Primitive Data Types
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John Nunemaker
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September 03, 2009
Programming
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Primitive Data Types
John Nunemaker
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September 03, 2009
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Transcript
Data Types Thursday, September 3, 2009
undefined any variable that has not been assigned a value
and any property of an object that does not exist Thursday, September 3, 2009
null indicates that variable has been declared but defined empty
Thursday, September 3, 2009
number • values that can be processed and calculated •
can be positive or negative • represented internally as a double, accurate to 14 or 15 digits Thursday, September 3, 2009
number Thursday, September 3, 2009
number calculations Thursday, September 3, 2009
Math! http://www.w3schools.com/jsref/jsref_obj_math.asp Thursday, September 3, 2009
string • sequence of characters enclosed with quotation marks •
can use single or double quotes • cannot use quotes of the same type inside the same type unless they are escaped http://www.w3schools.com/jS/js_obj_string.asp Thursday, September 3, 2009
string characters Thursday, September 3, 2009
string characters Thursday, September 3, 2009
everything is zero indexed j a v a s c
r i p t 0 1 2 3 4 5 6 7 8 9 Thursday, September 3, 2009
string characters (shortcut) Thursday, September 3, 2009
string characters (shortcut) Thursday, September 3, 2009
string escaping cannot use quotes of the same type inside
the same type unless they are escaped Thursday, September 3, 2009
same quotes no escape FAIL! Thursday, September 3, 2009
meet the escape character \ Thursday, September 3, 2009
same quotes with escape WIN! Thursday, September 3, 2009
same quotes no escape FAIL! Thursday, September 3, 2009
same quotes with escape WIN! Thursday, September 3, 2009
different quotes WIN! Thursday, September 3, 2009
different quotes WIN! Thursday, September 3, 2009
string length Thursday, September 3, 2009
string search Thursday, September 3, 2009
changing string case Thursday, September 3, 2009
string to number Thursday, September 3, 2009
string to number Thursday, September 3, 2009
string to number Thursday, September 3, 2009
“class is awesome”.charAt(2) Thursday, September 3, 2009
“class is awesome”.charAt(2) “a” Thursday, September 3, 2009
“class is awesome”[0] Thursday, September 3, 2009
“class is awesome”[0] “c” Thursday, September 3, 2009
how do I get the length of “football” Thursday, September
3, 2009
how do I get the length of “football” “football”.length Thursday,
September 3, 2009
“football”.length Thursday, September 3, 2009
“football”.length 8 Thursday, September 3, 2009
“football”.indexOf(‘e’) Thursday, September 3, 2009
“football”.indexOf(‘e’) -1 Thursday, September 3, 2009
“football”.indexOf(‘foot’) Thursday, September 3, 2009
“football”.indexOf(‘foot’) 0 Thursday, September 3, 2009
what type is: ‘asdf’ Thursday, September 3, 2009
what type is: ‘asdf’ “string” Thursday, September 3, 2009
what type is: 15 Thursday, September 3, 2009
what type is: 15 “number” Thursday, September 3, 2009
what type is: -’15’ Thursday, September 3, 2009
what type is: -’15’ “number” Thursday, September 3, 2009
10 + 20 Thursday, September 3, 2009
10 + 20 30 Thursday, September 3, 2009
boolean true or false http://www.w3schools.com/jS/js_obj_boolean.asp Thursday, September 3, 2009