2.4.2 Symbols

Booleans are also symbols; see Booleans for more operators.

(keywordp x) → t

x : t

Returns t if and only if x is a symbol in the "KEYWORD" package.

Examples:

> (keywordp :hints)

t

> (keywordp 'hints)

()

> (keywordp 5)

()

(symbol-< x y) → t

x : (symbolp x)

y : (symbolp y)

Returns non-nil when the symbol-name of x lexicographically precedes that of y. The returned number is the (0-based) position at which the names differ.

Examples:

> (symbol-< 'aaa 'aab)

t

> (symbol-< 'ab 'ab)

()

> (symbol-< 'bb 'aa)

()

> (symbol-< "ab" 'ab)

symbol->string: expects argument of type <symbol>; given

"ab"

(symbol-name x) → t

x : (symbolp x)

Returns a string containing the name of the given symbol

Examples:

> (symbol-name 'hello)

"HELLO"

> (symbol-name 'qwerty)

"QWERTY"

> (symbol-name "uh-oh")

symbol->string: expects argument of type <symbol>; given

"uh-oh"

(symbol-package-name x) → t

x : (symbolp x)

Returns the name of the package for the given symbol.

Examples:

> (symbol-package-name 'hello)

"COMMON-LISP"

> (symbol-package-name "uh-oh")

"COMMON-LISP"

(symbolp x)

Determines whether x is a symbol.

Examples:

> (symbolp 'hello)

t

> (symbolp "world")

()