eval

 

 

Description

The eval function evaluates the argument {exp} and returns the resulting value. When the input to eval is a List, invoking eval is equivalent to invoking morph, compile, and eval. If the eval function is passed a List as an argument, it is assumed that lexing has already taken place.

When to use

The eval function is used whenever an expression needs to be evaluated.

 

Syntax

(eval string)



Name Description AIS Types
string A string containing a Lisp language expression to be compiled and evaluated.String


Returns:

Always returns the result of (eval (compile (lisp string))).

 

Examples

Here are a number of links to Lambda coding examples which contain this instruction in various use cases.

Example_List_eval_002

This example show how the eval function evaluate an expression contained in a List.

Example_List_eval_003

When the input to eval is a quoted list, invoking eval is equivalent to reducing the quote count by one as shown in this example.

 

Argument Types

Here are the links to the data types of the function arguments.

Pair List Lambda String

Here are also a number of links to functions having arguments with any of these data types.

*=(Symbol) addMethod(BitVector) addMethod(Boolean) addMethod(Brick)
addMethod(Character) addMethod(CpxVector) addMethod(Date) addMethod(Dictionary)
addMethod(Directory) addMethod(FltVector) addMethod(Function) addMethod(IntVector)
addMethod(List) addMethod(Matrix) addMethod(NumMatrix) addMethod(NumVector)
addMethod(Number) addMethod(ObjVector) addMethod(ObjectRepository) addMethod(Pair)
addMethod(PcodeVector) addMethod(ShortVector) addMethod(String) addMethod(Structure)
addMethod(Symbol) addMethod(Vector) addMethod(Void) appendWriteln(ByteVector)
append(BitVector) append(Complex) append(CpxVector) append(FltVector)
append(IntVector) append(Matrix) append(NumMatrix) append(NumVector)
append(ObjVector) append(Pair) append(ShortVector) append(String)
append(Structure) append(Symbol) append(Vector) apply(BitVector)
apply(CpxVector) apply(FltVector) apply(IntVector) apply(Matrix)
apply(NumMatrix) apply(NumVector) apply(Pair) apply(ShortVector)
apply(Structure) apply(Vector) argCount(Lambda) argFetch(Lambda)
associate(Pair) attachLibrarian(ObjectRepository) balance(Lambda) binaryInsert(CpxVector)
binaryInsert(FltVector) binaryInsert(IntVector) binaryInsert(Matrix) binaryInsert(NumMatrix)
binaryInsert(NumVector) binaryInsert(ShortVector) binaryInsert(Structure) binaryInsert(Vector)
binarySearch(CpxVector) binarySearch(Dictionary) binarySearch(FltVector) binarySearch(IntVector)
binarySearch(Matrix) binarySearch(NumMatrix) binarySearch(NumVector) binarySearch(ObjVector)
binarySearch(ShortVector) binarySearch(Structure) binarySearch(Vector) boolean(Boolean)
c..r(List) callcc(Lambda) car(List) car(Pair)
cdr(BitVector) cdr(Brick) cdr(CpxVector) cdr(Dictionary)
cdr(Directory) cdr(FltVector) cdr(IntVector) cdr(List)
cdr(Matrix) cdr(NumMatrix) cdr(NumVector) cdr(ObjVector)
cdr(ShortVector) cdr(Structure) cdr(Vector) character(Character)
clean(String) closeLog(FileIO) code(String) compareEQ(BitVector)
compareEQ(Boolean) compareEQ(Brick) compareEQ(Character) compareEQ(Complex)
compareEQ(CpxVector) compareEQ(Date) compareEQ(Dictionary) compareEQ(Directory)
compareEQ(FltVector) compareEQ(Function) compareEQ(IntVector) compareEQ(Lambda)
compareEQ(List) compareEQ(Matrix) compareEQ(NumMatrix) compareEQ(NumVector)
compareEQ(Number) compareEQ(ObjVector) compareEQ(ObjectRepository) compareEQ(Pair)
compareEQ(ShortVector) compareEQ(String) compareEQ(Structure) compareEQ(Symbol)
compareEQ(Vector) compareEQ(Void) compareGE(BitVector) compareGE(Boolean)
compareGE(Brick) compareGE(Character) compareGE(Complex) compareGE(CpxVector)
compareGE(Date) compareGE(Dictionary) compareGE(Directory) compareGE(Function)
compareGE(IntVector) compareGE(Lambda) compareGE(List) compareGE(Matrix)
compareGE(NumMatrix) compareGE(Number) compareGE(ObjVector) compareGE(ObjectRepository)
compareGE(Pair) compareGE(ShortVector) compareGE(String) compareGE(Structure)
compareGE(Symbol) compareGE(Vector) compareGE(Void) compareGT(BitVector)
compareGT(Boolean) compareGT(Brick) compareGT(Character) compareGT(Complex)
compareGT(CpxVector) compareGT(Date) compareGT(Dictionary) compareGT(Directory)
compareGT(Function) compareGT(IntVector) compareGT(Lambda) compareGT(List)
compareGT(Matrix) compareGT(NumMatrix) compareGT(NumVector) compareGT(Number)
compareGT(ObjVector) compareGT(ObjectRepository) compareGT(Pair) compareGT(ShortVector)
compareGT(String) compareGT(Structure) compareGT(Symbol) compareGT(Vector)
compareGT(Void) compareLE(BitVector) compareLE(Boolean) compareLE(Brick)
compareLE(Character) compareLE(Complex) compareLE(CpxVector) compareLE(Date)
compareLE(Dictionary) compareLE(Directory) compareLE(FltVector) compareLE(Function)
compareLE(IntVector) compareLE(Lambda) compareLE(List) compareLE(Matrix)
compareLE(NumMatrix) compareLE(NumVector) compareLE(Number) compareLE(ObjVector)
compareLE(ObjectRepository) compareLE(Pair) compareLE(ShortVector) compareLE(String)
compareLE(Structure) compareLE(Symbol) compareLE(Vector) compareLE(Void)
compareLT(BitVector) compareLT(Boolean) compareLT(Brick) compareLT(Character)
compareLT(Complex) compareLT(CpxVector) compareLT(Date) compareLT(Dictionary)
compareLT(Directory) compareLT(FltVector) compareLT(Function) compareLT(IntVector)
compareLT(Lambda) compareLT(List) compareLT(Matrix) compareLT(NumMatrix)
compareLT(NumVector) compareLT(Number) compareLT(ObjVector) compareLT(ObjectRepository)
compareLT(Pair) compareLT(ShortVector) compareLT(String) compareLT(Structure)
compareLT(Symbol) compareLT(Vector) compareLT(Void) compareNE(BitVector)
compareNE(Boolean) compareNE(Brick) compareNE(Character) compareNE(Complex)
compareNE(CpxVector) compareNE(Date) compareNE(Dictionary) compareNE(Directory)
compareNE(FltVector) compareNE(Function) compareNE(IntVector) compareNE(Lambda)
compareNE(List) compareNE(Matrix) compareNE(NumMatrix) compareNE(NumVector)
compareNE(Number) compareNE(ObjVector) compareNE(ObjectRepository) compareNE(Pair)
compareNE(ShortVector) compareNE(String) compareNE(Structure) compareNE(Symbol)
compareNE(Vector) compareNE(Void) compare(BitVector) compare(Boolean)
compare(Brick) compare(Character) compare(Complex) compare(CpxVector)
compare(Date) compare(Dictionary) compare(Directory) compare(FltVector)
compare(Function) compare(IntVector) compare(Lambda) compare(List)
compare(Matrix) compare(NumMatrix) compare(NumVector) compare(Number)
compare(ObjVector) compare(ObjectRepository) compare(Pair) compare(ShortVector)
compare(String) compare(Structure) compare(Symbol) compare(Vector)
compare(Void) comparison(BitVector) comparison(Boolean) comparison(Brick)
comparison(Character) comparison(Complex) comparison(Date) comparison(Dictionary)
comparison(Directory) comparison(FltVector) comparison(Function) comparison(IntVector)
comparison(List) comparison(Matrix) comparison(NumMatrix) comparison(NumVector)
comparison(Number) comparison(ObjVector) comparison(ObjectRepository) comparison(Pair)
comparison(ShortVector) comparison(String) comparison(Structure) comparison(Symbol)
comparison(Vector) comparison(Void) compile(Lambda) compile(List)
compress(ByteVector) cons(Pair) copy(BitVector) copy(Brick)
copy(CpxVector) copy(Dictionary) copy(Directory) copy(FltVector)
copy(IntVector) copy(Lambda) copy(List) copy(Matrix)
copy(NumMatrix) copy(NumVector) copy(ObjVector) copy(Pair)
copy(PcodeVector) copy(ShortVector) copy(Structure) copy(Vector)
count(Dictionary) count(Directory) count(List) count(Matrix)
count(NumMatrix) count(Pair) count(Structure) count(Vector)
date(Date) day(Date) days360(Date) debugBrowsableProcs(Context)
debugBrowsableProcs(Lambda) debugDialog(String) debug(Context) debug(Lambda)
defchild(Lambda) define(macro)(Lambda) define(Lambda) defmacro(Lambda)
deforphan(Lambda) defriend(Lambda) defun(Lambda) delete(Dictionary)
delete(Directory) delete(FltVector) delete(IntVector) delete(List)
delete(Matrix) delete(NumMatrix) delete(NumVector) delete(ObjVector)
delete(ObjectRepository) delete(Pair) delete(ShortVector) delete(Structure)
delete(Vector) detachLibrarian(ObjectRepository) disassemble(Context) disassemble(Lambda)
display(ByteVector) display(FileIO) downcase(String) downcase(Symbol)
encode(ByteVector) evalInSyncLocalContext(Context) eval(Lambda) eval(List)
exportTab(Lambda) exportTab(ObjectRepository) fileReadRecord(ByteVector) fileReadRecord(String)
fileReadRecord(Text) find(String) getContextPtr(Context) getHttp(String)
getHttp(Text) globalBinding(Context) globalBinding(Lambda) hashString(String)
hashString(Symbol) hour(Date) importTab(Lambda) importTab(ObjectRepository)
insert(Dictionary) insert(Directory) insert(FltVector) insert(IntVector)
insert(Matrix) insert(NumMatrix) insert(NumVector) insert(ObjVector)
insert(ShortVector) insert(Structure) insert(Vector) inside(BitVector)
inside(Dictionary) inside(Directory) inside(IntVector) inside(List)
inside(Matrix) inside(NumMatrix) inside(NumVector) inside(ShortVector)
inside(Structure) inside(Vector) inspect(Context) inspect(Lambda)
inspect(ObjectRepository) integer(Integer) isAtom(BitVector) isAtom(Brick)
isAtom(Dictionary) isAtom(Directory) isAtom(FltVector) isAtom(IntVector)
isAtom(List) isAtom(Matrix) isAtom(NumMatrix) isAtom(NumVector)
isAtom(ObjVector) isAtom(Pair) isAtom(PcodeVector) isAtom(ShortVector)
isAtom(Structure) isAtom(Vector) isBitVector(BitVector) isBoolean(Boolean)
isByteVector(ByteVector) isCharAlphabetic(ByteVector) isCharAlphabetic(String) isCharAlphabetic(Symbol)
isCharAlphanumeric(ByteVector) isCharAlphanumeric(String) isCharAlphanumeric(Symbol) isCharLowercase(ByteVector)
isCharLowercase(String) isCharLowercase(Symbol) isCharName(ByteVector) isCharName(String)
isCharName(Symbol) isCharNumeric(ByteVector) isCharNumeric(String) isCharNumeric(Symbol)
isCharUppercase(ByteVector) isCharUppercase(String) isCharUppercase(Symbol) isCharWhitespace(ByteVector)
isCharWhitespace(String) isCharWhitespace(Symbol) isChar(String) isCharacter(Character)
isComplex(Complex) isDate(Date) isDictionary(Dictionary) isDirectory(Directory)
isEqual(BitVector) isEqual(Boolean) isEqual(Brick) isEqual(Character)
isEqual(Complex) isEqual(Date) isEqual(Dictionary) isEqual(Directory)
isEqual(FltVector) isEqual(Function) isEqual(IntVector) isEqual(List)
isEqual(Matrix) isEqual(NumMatrix) isEqual(NumVector) isEqual(Number)
isEqual(ObjVector) isEqual(Pair) isEqual(ShortVector) isEqual(String)
isEqual(Structure) isEqual(Vector) isEqual(Void) isError(Error)
isFloatVector(FltVector) isIdentical(BitVector) isIdentical(Boolean) isIdentical(Brick)
isIdentical(Character) isIdentical(Complex) isIdentical(Date) isIdentical(Dictionary)
isIdentical(Directory) isIdentical(Error) isIdentical(FltVector) isIdentical(Function)
isIdentical(IntVector) isIdentical(List) isIdentical(Matrix) isIdentical(NumMatrix)
isIdentical(NumVector) isIdentical(Number) isIdentical(ObjVector) isIdentical(ObjectRepository)
isIdentical(Pair) isIdentical(PcodeVector) isIdentical(ShortVector) isIdentical(Structure)
isIdentical(Vector) isIdentical(Void) isInside(BitVector) isInside(Dictionary)
isInside(Directory) isInside(IntVector) isInside(List) isInside(Matrix)
isInside(NumMatrix) isInside(NumVector) isInside(ObjVector) isInside(Pair)
isInside(ShortVector) isInside(Structure) isInside(Vector) isIntegerVector(IntVector)
isInteger(Integer) isMatrix(Matrix) isMember(BitVector) isMember(Dictionary)
isMember(Directory) isMember(IntVector) isMember(List) isMember(Matrix)
isMember(NumMatrix) isMember(NumVector) isMember(ObjVector) isMember(Pair)
isMember(ShortVector) isMember(Structure) isMember(Vector) isMoney(Number)
isNumberMatrix(NumMatrix) isNumberVector(NumVector) isNumber(Number) isObjectVector(ObjVector)
isObject(BitVector) isObject(Brick) isObject(ByteVector) isObject(Dictionary)
isObject(Directory) isObject(FltVector) isObject(IntVector) isObject(List)
isObject(Matrix) isObject(NumMatrix) isObject(NumVector) isObject(ObjVector)
isObject(Pair) isObject(PcodeVector) isObject(ShortVector) isObject(String)
isObject(Structure) isObject(Symbol) isObject(Vector) isPair(List)
isPair(Pair) isPcodeVector(PcodeVector) isString(String) isStructure(Structure)
isSymbol(Symbol) isText(String) isType(BitVector) isType(Boolean)
isType(Brick) isType(Character) isType(Complex) isType(Date)
isType(Dictionary) isType(Directory) isType(FltVector) isType(Function)
isType(IntVector) isType(Matrix) isType(NumMatrix) isType(NumVector)
isType(Number) isType(ObjVector) isType(ObjectRepository) isType(Pair)
isType(ShortVector) isType(String) isType(Structure) isType(Symbol)
isType(Vector) isType(Void) isVector(Vector) julian(Date)
lambda(Lambda) last(List) left(String) length(BitVector)
length(Brick) length(Dictionary) length(Directory) length(FltVector)
length(IntVector) length(List) length(Matrix) length(NumMatrix)
length(NumVector) length(ObjVector) length(ObjectRepository) length(Pair)
length(PcodeVector) length(ShortVector) length(String) length(Structure)
length(Symbol) length(Vector) lisp(Lambda) lisp(List)
list(List) loadLib(String) loadWorkspace(Context) macroReplace(String)
makeLambda(Lambda) makeQuotedList(List) makeQuotedSymbol(Symbol) map(Dictionary)
map(Directory) map(FltVector) map(IntVector) map(List)
map(Matrix) map(NumMatrix) map(NumVector) map(Pair)
map(ShortVector) map(Structure) map(Vector) mapc(Dictionary)
mapc(Directory) mapc(FltVector) mapc(IntVector) mapc(List)
mapc(Matrix) mapc(NumMatrix) mapc(NumVector) mapc(Pair)
mapc(ShortVector) mapc(Structure) mapc(Vector) member(BitVector)
member(Dictionary) member(Directory) member(IntVector) member(List)
member(Matrix) member(NumMatrix) member(NumVector) member(ObjVector)
member(ShortVector) member(Structure) member(Vector) mid(String)
minute(Date) money(Number) month(Date) morph(List)
myself(Lambda) new(BitVector) new(Brick) new(ByteVector)
new(CpxVector) new(Dictionary) new(Directory) new(FltVector)
new(IntVector) new(Lambda) new(Matrix) new(NumMatrix)
new(NumVector) new(ObjVector) new(ObjectRepository) new(PcodeVector)
new(ShortVector) new(String) new(Structure) new(Symbol)
new(Vector) number(Number) objectToList(List) objectToMatrix(Matrix)
objectToNumMatrix(NumMatrix) objectToNumVector(NumVector) objectToVector(Vector) onError(Error)
onError(Lambda) openLog(FileIO) openLog(String) pair(Pair)
parse(String) postHttp(String) postHttp(Text) proplist(Symbol)
proprecord(Symbol) putprop(Symbol) quote(List) readHtmlPage(String)
readHtmlPage(Text) refLibrarian(ObjectRepository) ref(BitVector) ref(Boolean)
ref(Brick) ref(Character) ref(Complex) ref(Date)
ref(Dictionary) ref(Directory) ref(FltVector) ref(Function)
ref(IntVector) ref(Lambda) ref(List) ref(Matrix)
ref(NumMatrix) ref(NumVector) ref(Number) ref(ObjVector)
ref(ObjectRepository) ref(PcodeVector) ref(ShortVector) ref(String)
ref(Structure) ref(Symbol) ref(Vector) ref(Void)
remProp(Symbol) remove(BitVector) remove(Dictionary) remove(Directory)
remove(IntVector) remove(Matrix) remove(NumMatrix) remove(NumVector)
remove(ObjVector) remove(ShortVector) remove(Structure) remove(Vector)
replace(String) rept(String) requestHttp(String) requestHttp(Text)
reverse(BitVector) reverse(FltVector) reverse(IntVector) reverse(List)
reverse(Matrix) reverse(NumMatrix) reverse(NumVector) reverse(ObjVector)
reverse(ShortVector) reverse(Vector) right(String) run(ByteVector)
run(Text) saveImmediate(ObjectRepository) saveObject(ByteVector) saveObject(Integer)
saveWorkspace(Context) second(Date) send(BitVector) send(Boolean)
send(Brick) send(Character) send(CpxVector) send(Date)
send(Dictionary) send(Directory) send(FltVector) send(Function)
send(IntVector) send(Lambda) send(List) send(Matrix)
send(NumMatrix) send(NumVector) send(Number) send(ObjectRepository)
send(Pair) send(ShortVector) send(String) send(Structure)
send(Symbol) send(Vector) send(Void) setCar(List)
setCar(Pair) setCdr(BitVector) setCdr(Brick) setCdr(Dictionary)
setCdr(Directory) setCdr(FltVector) setCdr(IntVector) setCdr(List)
setCdr(Matrix) setCdr(NumMatrix) setCdr(NumVector) setCdr(ObjVector)
setCdr(Pair) setCdr(ShortVector) setCdr(Structure) setCdr(Vector)
setLastCdr(BitVector) setLastCdr(FltVector) setLastCdr(IntVector) setLastCdr(List)
setLastCdr(Matrix) setLastCdr(NumMatrix) setLastCdr(NumVector) setLastCdr(ObjVector)
setLastCdr(Structure) setLastCdr(Vector) set(ObjectRepository) setf(ObjectRepository)
setq(BitVector) setq(Boolean) setq(Brick) setq(Character)
setq(Date) setq(Dictionary) setq(Directory) setq(FltVector)
setq(IntVector) setq(Lambda) setq(List) setq(Matrix)
setq(NumVector) setq(Number) setq(ObjVector) setq(ObjectRepository)
setq(PcodeVector) setq(ShortVector) setq(String) setq(Structure)
setq(Symbol) setq(Vector) setq(Void) sizeof(BitVector)
sizeof(Boolean) sizeof(Brick) sizeof(ByteVector) sizeof(Character)
sizeof(Complex) sizeof(Date) sizeof(Dictionary) sizeof(Directory)
sizeof(FltVector) sizeof(Function) sizeof(IntVector) sizeof(List)
sizeof(Matrix) sizeof(NumMatrix) sizeof(NumVector) sizeof(Number)
sizeof(ObjVector) sizeof(ObjectRepository) sizeof(Pair) sizeof(PcodeVector)
sizeof(ShortVector) sizeof(String) sizeof(Structure) sizeof(Symbol)
sizeof(Vector) sizeof(Void) sort(BitVector) sort(Dictionary)
sort(Directory) sort(FltVector) sort(IntVector) sort(List)
sort(Matrix) sort(NumMatrix) sort(NumVector) sort(ObjVector)
sort(ShortVector) sort(Structure) sort(Vector) stringCiEQ(String)
stringCiGE(String) stringCiGT(String) stringCiLE(String) stringCiLT(String)
stringCiNE(String) stringFill(String) stringToBVector(String) stringToVector(String)
string(Complex) string(String) submit(Context) substitute(String)
substringCiEQ(String) substringCiGE(String) substringCiGT(String) substringCiLE(String)
substringCiLT(String) substringCiNE(String) substringEQ(String) substringFill(String)
substringGE(String) substringGT(String) substringLE(String) substringLT(String)
substringNE(String) substring(String) symbol(Symbol) system(ByteVector)
system(Text) testFunction(Structure) text(String) time(Date)
trim(String) type(BitVector) type(Boolean) type(Brick)
type(ByteVector) type(Character) type(Complex) type(Date)
type(Dictionary) type(Directory) type(FltVector) type(Function)
type(IntVector) type(Lambda) type(Matrix) type(NumMatrix)
type(NumVector) type(Number) type(ObjVector) type(ObjectRepository)
type(Pair) type(PcodeVector) type(ShortVector) type(String)
type(Structure) type(Symbol) type(Vector) type(Void)
uniqueInsert(FltVector) uniqueInsert(IntVector) uniqueInsert(Matrix) uniqueInsert(NumMatrix)
uniqueInsert(NumVector) uniqueInsert(ObjVector) uniqueInsert(ShortVector) uniqueInsert(Structure)
uniqueInsert(Vector) upcase(String) upcase(Symbol) vectorFill(BitVector)
vectorFill(FltVector) vectorFill(IntVector) vectorFill(Matrix) vectorFill(NumMatrix)
vectorFill(NumVector) vectorFill(ObjVector) vectorFill(ShortVector) vectorFill(Vector)
writeln(ByteVector) writeln(String) writeln(Text) year(Date)

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