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Chapter3:User-DefinedFunctions
36
DateobjectsowecancallthegetDay()methodonit.ThegetDay()
methodreturnstheweekdayasanintegerstartingwith0(zero)for
Sunday.Havingthedaynumber,wecanuseitaskeyforourobject
dayNumberNameMaptoreturnthe dayname.Tousethe function
DAYNAMEasauser-definedfunction,copythecodeintotheScript
Editor andcall itfromthe spreadsheetlike this where the return
valueofthebuilt-inTODAY()functionisgivenasanargument:
1
=DAYNAME(TODAY())
Alltheuser-definedfunctionsgivensofarreturnascalarvaluebut
theycanalsoreturnarrayswhereeacharrayelementisenteredinto
itsowncell.Anexamplewillhelptoillustratethis.Inthisexample,
wewrite afunctionthatreturnsalldatesthatfall onagivenday
betweentwodates.
CodeExample3.10
1
/**
2
* Add a given number of days to the given date
3
* and return the new date.
4
*
5
* @param {Date} date
6
* @param {number} days
7
* @return {Date}
8
*/
9
function addDays(date, days) ) {
10
// Taken from Stackoverflow:
11
// questions/563406/add-days-to-datetime
12
var result = new Date(date);
13
result.setDate(result.getDate() + days);
14
return result;
15
}
16
17
/**
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Chapter3:User-DefinedFunctions
37
18
* Given a start date, an end date and a day name,
19
* return an array of all dates that fall (inclusive)
20
* between those two dates for the given day name.
21
*
22
* @param {Date} startDate
23
* @param {Date} endDate
24
* @param {String} dayName
25
* @return {Date[]}
26
* @customfunction
27
*/
28
function DATESOFDAY(startDate, endDate, , dayName) {
29
var dayNameDates [],
30
testDate = startDate,
31
testDayName;
32
while(testDate <= endDate) {
33
testDayName DAYNAME(testDate);
34
if(testDayName.toLowerCase() ===
35
dayName.toLowerCase()) {
36
dayNameDates.push(testDate);
37
}
38
testDate = addDays(testDate, 1);
39
}
40
return dayNameDates;
41
}
The code in example 3.10 defines a user-defined function called
DATESOFDAY() that calls two other GAS functions, addDays()
and DAYNAME() to perform some of the computation. Function
DAYNAME() was described in code example 3.9 above will be
neededwhenyoupastethiscodeintotheScriptEditor.Thefunction
addDays() was copied from this location on Stackoverflow.¹⁶. I
stated earlier that date manipulation can be complex and the
discussionthreadonthisStackoverflowentrycertainlyprovesthat.
¹⁶
http://stackoverflow.com/questions/563406/add-days-to-datetime
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Chapter3:User-DefinedFunctions
38
Before discussing the actual code in example 3.10 in detail, first
note howauser-definedfunctioncancallotherGAS functionsto
perform some of its tasks ascan be seen in this example where
twoother functionsarecalledandtheirreturnvaluesareusedby
DATESOFDAY().Byoff-loadingmuchofitswork,DATESOFDAY()
remainssmallonmanageable.
MakeFunctions Small
De-composing a programming task into multiple
small functions makes each function easierto test,
de-bugandre-use
DATESOFDAY() takestwo dates anda day name as argument. I
have not added any checking of types or numbers of argument,
these could be easily added using the techniques discussed ear-
lier.Thefunctiondeclarestwolocalvariables,dayNameDatesand
testDate. It initialises testDate to startDate and then enters the
while loop. Each round of the while loop gets the name of the
day for the testDate using the DAYNAME function described in
code example 3.9. The returned day name is then compared to
thegivenargumentdayname(dayName)usingacase-insensitive
comparison by calling the string methodtoLowerCase() on both
string operands. Ifthey are equal, the date is added to the array
using theArray push() method.Thistechnique ofbuildingarrays
in loops will be seen throughoutthe book. JavaScript arraysare
extremelyflexibleandimplementarangeofveryusefulmethods.
Manyofthesemethodswillbeencounteredlaterinthisbook.After
testingthedayofthedate,thetestdateisincrementedbyoneday
using the addDays()function. TheconditiontestDate <=endDate
istestedinthenextroundofthe while loopandtheloop finishes
whentheconditionevaluatestofalseandthedayNameDatesarray
isreturned.
When the function DATESOFDAY() is called as a user-defined
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Chapter3:User-DefinedFunctions
39
function, it writes the entire array to a single column, see the
screenshotbelow:
Figure3-5:Callinguser-definedfunctionthatreturnsanarrayofvalues.
3.12TextFunctions
GoogleSpreadsheetstextmanipulationfunctionscanalsobecom-
plementedandenhancedbywritinguser-definedfunctions.JavaScript,
likemostprogramminglanguages,referstothetexttypeas“string”.
StringsinJavaScriptareprimitivetypesbuttheycanbewrappedto
behavelikeobjects.Thewrappingofaprimitivesothatitbecomes
anobjectisknownasauto-boxing.Auto-boxingcanalsobeapplied
to Boolean andNumber primitive types andthough I have never
seen any use for it, with Boolean. The Number type has some
useful methodslike toFixed(). Since auto-boxing istransparentto
the user/programmer, allthatreallymattersisthatstringscanbe
treatedasthoughthey have methodsthatcanbe usedto extract
informationfromthemandtogeneratenewstrings.
ToseealltheStringpropertiessupportedbyGAS/JavaScript,paste
thefollowingcode intothescripteditor andexecuteit. Analpha-
beticallistofstringpropertiesissenttothelogger.
CodeExample3.11
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Chapter3:User-DefinedFunctions
40
1
/**
2
* Print all string properties to the
3
* Script Editor Logger
4
* @return {undefined}
5
*/
6
function printStringMethods() {
7
var strMethods =
8
Object.getOwnPropertyNames(
9
String.prototype);
10
Logger.log('String has ' +
11
strMethods.length +
12
' properties.');
13
Logger.log(strMethods.sort().join('\n'));
14
}
The code above usesJavaScript’s verypowerful introspection ca-
pabilitiestoextractanarrayofallthepropertynamesdefinedfor
objectString onwhatisknownasitsprototype.Theprototypeis
apropertythatrefers to anobjectwhere the String methodsare
definedin the prototype. Prototypesare quite an advanced topic
buttheyare veryimportantandprovide the basisfor inheritance
inJavaScript.AllJavaScriptobjects(thatincludesarraysandfunc-
tions) have a prototype property. The logger output shows that
thereare38Stringproperties.Mostaremethodsbuttheimportant
lengthproperty, for example, isnot. Code example 3.11also uses
twoimportantArraymethods:sort()andjoin().Thesort()method
doesanalphabetical sortinthisexample andjoin()thenmakesa
string ofthe arrayusingthe givenargument(newline‘\n’inthis
example)toseparatetheconcatenatedarrayelements.Noticehow
themethodcallsare“chained”oneaftertheother.Thisisacommon
approachin JavaScript. As an exercise, you could trywriting an
equivalentfunctiontoprintoutallthearrayproperties.
Since the String object has so many methods, we can use these
methodsinuser-definedfunctions.Here isafunctionthatreturns
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Chapter3:User-DefinedFunctions
41
theargumentstringinreversecharacterorder.
CodeExample3.12
1
/**
2
* Given a string, return a new string
3
* with the characters in reverse order.
4
*
5
* @param {String} str
6
* @return {String}
7
* @customfunction
8
*/
9
function REVERSESTRING(str) {
10
var strReversed '',
11
lastCharIndex = str.length - 1,
12
i;
13
for (i lastCharIndex; i >= 0; i -= 1) {
14
strReversed += str[i];
15
}
16
return strReversed;
17
}
Reversing strings might not strike you as the most useful func-
tionalityunless of course you work with DNA or are interested
in palindromes. To see a palindrome example, call the function
withtheworddetartrated,yes,thatwordreallyexists.Theexample
functionusesaJavaScriptforlooptoextractthestringcharactersin
reverseorderandappendsthemtoanewstringthatisbuiltwithin
theloop.Thenewlybuiltstringisreturneduponcompletionofthe
loop. If youdeclare the variable strReversed butdo notassign it,
somethingunexpectedhappens.Asthevariableisunassigned,itis
undefined.Ifyouconcatenateastringtoundefinedyougetanother
ofthosetroublesomeimplicitJavaScriptconversionsthatIwarned
about earlier where undefined becomes the string “undefined!
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Chapter3:User-DefinedFunctions
42
Spreadsheetsgenerallyofferalargesetofbuilt-intextfunctionsand
Google Sheetsaugmentsthese with regular expressionfunctions.
Ihave covered regular expressions in two blog entries (see part
1here¹⁷ and part 2 here¹⁸.) I will include a chapter on regular
expressionlaterinthisbookandwillgivesomeregularexpression-
baseduser-definedfunctionexamplesthere.
3.13 UsingJavaScriptBuilt-InObject
Methods
JavaScriptprovidesasmallnumberofbuilt-inobjectsthatprovide
additionalfunctionalitythatcanbeusedinuser-definedfunctions.
For example, the JavaScriptMath object isavailable inGAS and
providessome useful methods. Simulation ofa die throwcan be
easilyimplementedusingitsmethods:
CodeExample3.13
1
/**
2
* Simulate a throw of a die
3
* by returning a number between
4
* and 6.
5
*
6
* @return {number}
7
* @customfunction
8
*/
9
function THROWDIE() {
10
return 1 + Math.floor(Math.random() * 6);
11
}
¹⁷
http://www.javascript-spreadsheet-programming.com/2013/09/regular-
expressions.html
¹⁸
http://www.javascript-spreadsheet-programming.com/2014/09/regular-expressions-
part-2.html
Chapter3:User-DefinedFunctions
43
Tryoutthefunctionbycalling=THROWDIE()fromanyspreadsheet
cell.
Thisfunctionusestwomethodsdefinedin theJavaScriptbuilt-in
Mathobjecttosimulatedice throwing.The Mathround()method
couldalsobeusedherebut,asisverywelldescribedhere¹⁹,itleads
tobiasedresults.Thisbecomesapparentwhenthefunctioniscalled
hundreds of times. The important point to note is the need for
testing andreading ofdocumentationtoavoidinadvertenterrors
andbiases.
3.14 Using A Function Callback
The object nature ofJavaScriptfunctionsallowsthem to be both
passedasargumentstootherfunctionsandtobereturnedbyother
functions.Thefollowingexampleprovidesanexampleofthepower
and flexibility of JavaScript. It also shows how easy it is to use
a range of cells as an argument. The function concatenates an
input range of cells using a delimiter argument. There is an in-
built Google Spreadsheet functioncalledJOIN thatperformsthis
taskbuttheuser-definedversionbelowhasoneadditionalfeature:
Itprovidesanoptionto enclose eachindividualelementinsingle
quotes.Hereisthecode:
CodeExample3.14
¹⁹
http://www.the-art-of-web.com/javascript/random/#.UPU8tKHC-nY
Chapter3:User-DefinedFunctions
44
1
/** Concatenate cell values from
2
* an input range.
3
* Single quotes around concatenated
4
* elements are optional.
5
*
6
* @param {String[]} inputFromRng
7
* @param {String} concatStr
8
* @param {Boolean} addSingleQuotes
9
* @return {String}
10
* @customfunction
11
*/
12
function CONCATRANGE(inputFromRng, concatStr,
13
addSingleQuotes) {
14
var cellValues;
15
if (addSingleQuotes) {
16
cellValues =
17
inputFromRng.map(
18
function (element) {
19
return "'" element "'";
20
});
21
return cellValues.join(concatStr);
22
}
23
return inputFromRng.join(concatStr);
24
}
Anexampleofacalltothisfunctioninthespreadsheetis=CONCA-
TRANGE(A1:A5, “,”true).Thisreturnsoutputlike ‘A’,’B’,’C’,’D’,’E’.
Therearetwointerestingaspectstothiscode:
1. TherangeinputisconvertedtoaJavaScriptarray.Inorderto
workcorrectly,alltheinputmustbefromthesamecolumn.
Ifthe inputrangeistwo-dimensionalor frommultiplecells
inthesamerow,itwillgenerateaJavaScriptarray-of-arrays.
Thatpointisignoredhere,buttrygivingitatwo-dimensional
rangeinputorsomethinglikeA1:C2”andobservetheoutput!
Chapter3:User-DefinedFunctions
45
2. The more interesting point is the use of the Array map()
method.Thismethoditeratesthearrayandappliesitsfunc-
tionargumenttoeachelementofthearrayandreturnsanew
array. The function used here isan anonymous function.
It takes one argument, the array element, and returns it
enclosedinsinglequotes.Theanonymousfunctionoperates
asa callback. More examplesofcallbackswill be given in
later chapters. Thisexample justhints atthe power ofthis
approach.
Aversion of this function was written in Excel VBA as a quick
way ofgenerating inputfor the IN clause in SQL. Listsof string
values (VARCHARs indatabase terminology) wouldbe provided
in spreadsheetsso an Excel user-definedfunction waswritten to
allowtheliststobeconcatenatedincomma-separatedstringswith
the constituentvaluesenclosedin single quotes. There are better
waysofrunningsuch queriesthatwill be discussedin the JDBC
chapterbutthisisanapproachthatcanbeuseful.
It is worthnoting that built-in Google Spreadsheetscan be com-
binedtogetthesameoutput:
1
=CONCATENATE("'", JOIN("','", A1:A5), "'")
However, no introductionto JavaScriptfunctionswouldbe com-
pletewithoutatleastabriefmentionofanonymousfunctionsand
callbacks.
3.15 Extracting Useful Information
AboutTheSpreadsheet
All the user-defined functions discussed up to this point were
written in host-independent JavaScript. Theyshould all work in
modernbrowsersorinNode.jsscripts.
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