Example Number isNull 001

 

 

Description

These examples determine if the argument is equal to the value of the Void Data Type.

 

Details

(isNull 1 ) Returns: false
(isNull #void ) Returns: true

An uninitialized variable has the value of #void..

(isNull x ) Returns: true

 

Related Examples

Here are examples of the isNull function at work.

Number isNull 001 Void isNull 001

 

Function Links

Here is the link to the current function used in this example.

isNull

Here are a number of links to other related functions.

isPositive(#void) isOdd(#void) isExact(#void) isZero(#void)
isEven(#void) isNegative(#void)

 

Argument Types

Here are the links to the data types of the arguments used in this example.

Number

Here are a number of links to examples having similar argument types.

BitVector setq 024 Complex * 002 Complex / 002 Complex compare 021
Complex cos 002 Complex exp 002 Complex expt 002 Complex log 002
Complex mod 002 Complex sqrt 002 Complex tan 002 Date date 001
Date day 001 Date days360 001 Date getTickCount 001 Date hour 001
Date isType 014 Date julian 001 Date minute 001 Date month 001
Date now 001 Date second 001 Date setq 019 Date sizeof 012
Date time 001 Date time 002 Date today 001 Date year 001
Dictionary isDictionary 001 FltVector setq 019 Function isType 015 Function sizeof 013
IntVector setq 020 Integer binaryNand 001 Integer binaryNor 001 Integer binaryNxor 001
Integer bitwiseAnd 001 Integer bitwiseNand 001 Integer bitwiseNor 001 Integer bitwiseNxor 001
Integer bitwiseOr 001 Integer bitwiseShiftLeft 001 Integer bitwiseShiftRight 001 Integer bitwiseXor 001
Integer fact 001 Integer isInteger 001 NumVector setq 021 NumVector svmRegression 001
NumVector vectorBinaryInnerProduct 001 NumVector vectorBipolarInnerProduct 001 NumVector vectorCosineInnerProduct 001 NumVector vectorCubeInnerProduct 001
NumVector vectorExpInnerProduct 001 NumVector vectorInnerProduct 001 NumVector vectorLogInnerProduct 001 NumVector vectorQuartInnerProduct 001
NumVector vectorQuintInnerProduct 001 NumVector vectorSigmoidInnerProduct 001 NumVector vectorSineInnerProduct 001 NumVector vectorSquareInnerProduct 001
NumVector vectorTanInnerProduct 001 NumVector vectorTanhInnerProduct 001 Number * 001 Number + 001
Number - 001 Number / 001 Number abs 001 Number add1 001
Number addMethod 014 Number addi 001 Number asin 001 Number atan 001
Number avg 001 Number compare 011 Number compareEQ 011 Number compareGE 011
Number compareGT 011 Number compareLE 011 Number compareLT 011 Number compareNE 011
Number comparison 010 Number cos 001 Number cosh 001 Number deg 001
Number divi 001 Number exp 001 Number expt 001 Number fact 001
Number floor 001 Number fraction 001 Number isEqual 009 Number isEven 001
Number isExact 001 Number isIdentical 009 Number isInexact 001 Number isMoney 001
Number isNegative 001 Number isNull 001 Number isNumber 001 Number isOdd 001
Number isPositive 001 Number isType 013 Number isZero 001 Number kurtosis 001
Number log 001 Number log10 001 Number log2 001 Number logbase 001
Number max 001 Number median 001 Number min 001 Number mod 001
Number modi 001 Number muli 001 Number nadd 001 Number ncompareGE 001
Number ncompareGT 001 Number ncompareLE 001 Number ncompareLT 001 Number ndiv 001
Number nmod 001 Number nmul 001 Number nsub 001 Number number 001
Number pi 001 Number product 001 Number rad 001 Number random 001
Number randomize 001 Number range 001 Number ref 019 Number round 001
Number setq 018 Number sign 001 Number sin 001 Number sinh 001
Number sizeof 011 Number skew 001 Number sqrt 001 Number srandom 001
Number stdev 001 Number stdevp 001 Number sub1 001 Number subi 001
Number sumsqr 001 Number tan 001 Number tanh 001 Number type 013
Number var 001 Number varp 001 ObjVector setq 022 PcodeVector setq 023
ShortVector setq 021 String isChar 001 String isCharAlphabetic 001 String isCharAlphanumeric 001
String isCharLowercase 001 String isCharName 001 String isCharNumeric 001 String isCharUppercase 001
String isCharWhitespace 001 String isEqual 001 String isEqual 002 String isObject 001
String isString 001 String isText 001 String isType 001 String isType 002
String isType 003 String parse 001 String sizeof 001 String string 001
String string 002 String string 003 String type 001 Symbol isCharName 002
Symbol isCharNumeric 002 Symbol isObject 002 Symbol isSymbol 001 Symbol isType 004
Symbol sizeof 002 Symbol type 002

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