Repeat each value a different number of times, in Google Sheets [duplicate] - excel

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Repeat each row N times in Google Sheets
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Given a list of values and a number n for each value, is there a way to create a 1-dimensional list with each value repeating n times?
A
B
C
1
animal
# repeats
result
2
aardvark
3
aardvark
3
badger
0
aardvark
4
capybara
1
aardvark
5
duck
2
capybara
6
duck
7
duck
Ideally, this would be a single formula in C2.
I'm working in Google Sheets, but I'd be interested in Excel answers, too.
Note that this is different from questions like these, which have the same n for all values.

Answer 1

You can try either
=TOCOL(MAP(A2:A,B2:B,LAMBDA(a,b,WRAPROWS(a,b,a))),3)
OR
=LAMBDA(z,FILTER(z,z<>""))(FLATTEN(MAP(A2:A,B2:B,LAMBDA(a,b,IF(a="",,IFERROR(SPLIT(REPT(a&"|",b),"|")))))))

Answer 2

pretty much the same:
=INDEX(TRIM(TRANSPOSE(SPLIT(QUERY(
REPT(A2:A10&"♠", B2:B10), ,9^9), "♠"))))

Answer 3

Repeat Rows a Given Number of Times (Excel Formula)
Due to the poor performance of the XLOOKUP or XMATCH functions (23s on 10k rows), the superior MATCH function is used with the INDEX function (3s on 10k rows).
LET
=LET(Data,A2:A5,Repeats,B2:B5,
Both,HSTACK(Data,Repeats),Filtered,FILTER(Both,Repeats>0),
dData,TAKE(Filtered,,1),dStacked,VSTACK(dData,""),
rData,TAKE(Filtered,,-1),rSequence,SEQUENCE(SUM(rData)),
rStacked,VSTACK(0,rData),rScanned,SCAN(1,rStacked,LAMBDA(a,b,a+b)),
rIndexes,MATCH(rSequence,rScanned),
Result,INDEX(dStacked,rIndexes),Result)
If you prefer fewer variables:
=LET(Data,A2:A5,Repeats,B2:B5,
Filtered,FILTER(HSTACK(Data,Repeats),Repeats>0),
dStacked,VSTACK(TAKE(Filtered,,1),""),
rData,TAKE(Filtered,,-1),rSequence,SEQUENCE(SUM(rData)),
rScanned,SCAN(1,VSTACK(0,rData),LAMBDA(a,b,a+b)),
Result,INDEX(dStacked,MATCH(rSequence,rScanned)),Result)
Screenshot Formulas
F2 =HSTACK(A2:A5,B2:B5)
H2 =FILTER(F3#,B2:B5>0)
J2 =TAKE(H3#,,1)
K2 =VSTACK(J3#,"")
L2 =TAKE(H3#,,-1)
M2 =SEQUENCE(SUM(L3#))
N2 =VSTACK(0,L3:L5)
O2 =SCAN(1,N3#,LAMBDA(a,b,a+b))
P2 =MATCH(M3#,O3#)
Q2 =INDEX(K3#,P3#)
R2 =LAMBDA(Data,Repeats,LET(
Both,HSTACK(Data,Repeats),Filtered,FILTER(Both,Repeats>0),
dData,TAKE(Filtered,,1),dStacked,VSTACK(dData,""),
rData,TAKE(Filtered,,-1),rSequence,SEQUENCE(SUM(rData)),
rStacked,VSTACK(0,rData),rScanned,SCAN(1,rStacked,LAMBDA(a,b,a+b)),
rIndexes,MATCH(rSequence,rScanned),
Result,INDEX(dStacked,rIndexes),Result))(A2:A5,B2:B5)
S2 =LAMBDA(Data,Repeats,LET(
Both,HSTACK(Data,Repeats),Filtered,FILTER(Both,Repeats>0),
dData,TAKE(Filtered,,1),dStacked,VSTACK(dData,""),
rData,TAKE(Filtered,,-1),rSequence,SEQUENCE(SUM(rData)),
rStacked,VSTACK(0,rData),rScanned,SCAN(1,rStacked,LAMBDA(a,b,a+b)),
rIndexes,MATCH(rSequence,rScanned),
Result,INDEX(dStacked,rIndexes),Result))
Using the last formula, define a name e.g. RepeatSeq, and use the name instead:
=RepeatSeq(A2:A5,B2:B5)