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Racket's Basic Data TypesCS 3540 Programming Languages
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Racket's Basic Data TypesCS 3540 Programming Languages
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Any kind of number. Racket makes no distinction between integers, real numbers, rationals, etc. Literal representations match what you are used to from math and from other programming languages.
| Operations | Description |
| number? | type predicate - returns true if argument is a number |
| zero? | test if argument is zero |
| =, <, <=, >, >= | comparison operators |
| +, -, *, /, etc. | standard arithmetic operations |
Two possible values: #t for true, #f for false.
| Operations | Description |
| boolean? | type predicate |
| eq? | equality test |
| and, or, not | standard boolean operators |
An identifier that is used as a value. We must "quote" the identifier so the interpreter knows not to evaluate the identifier. This is done either as (quote blue) or 'blue.
| Operations | Description |
| symbol? | type predicate |
| eq? | equality predicate |
For printable literals -- precede with a #\ (for example, #\a).
For nonprintable literals -- use special name preceded by #\ (for example, #\space and #\newline).
| Operations | Description |
| char? | type predicate |
| char-alphabetic?, char-numeric?, char-whitespace? | determine the subtype of the character |
| char=?, char<?, char>?, char<=?, char>= |
comparison operators |
| char->integer | conversion from character to ASCII value |
A sequence of characters surrounded by double quotes ("").
| Operations | Description |
| string? | type predicate |
| string=?, string<?, string<=?, string>?, string>=? | comparison operators |
| string-ci=?, string-ci<?, string-ci<=?, string-ci>?, string-ci>=? | comparison operators (case insensitive) |
| string-length | returns length of argument |
| string-ref | returns character at given index |
| string-append | concatenation |
| string->symbol, string->number, string->list | conversion to symbol, number, and list, respectfully |
| string | creates a string from a sequence of characters |