Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
3 +1 byte, use a safer verb composition
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K (ngn/k), 1213 bytes

{.,/$x+!2}'!:

Try it online!Try it online!

! generate the list 0 1 ... n-1

{ } is a function with argument x

' applied to each

!2 is 0 1

x+!2 is x, x+1

$ format as strings

,/ concatenate

. evaluate (convert to number)

K (ngn/k), 12 bytes

{.,/$x+!2}'!

Try it online!

! generate the list 0 1 ... n-1

{ } is a function with argument x

' applied to each

!2 is 0 1

x+!2 is x, x+1

$ format as strings

,/ concatenate

. evaluate (convert to number)

K (ngn/k), 13 bytes

{.,/$x+!2}'!:

Try it online!

! generate the list 0 1 ... n-1

{ } is a function with argument x

' applied to each

!2 is 0 1

x+!2 is x, x+1

$ format as strings

,/ concatenate

. evaluate (convert to number)

2 explanation
source | link

K (ngn/k), 12 bytes

{.,/$x+!2}'!

Try it online!

! generate the list 0 1 ... n-1

{ } is a function with argument x

' applied to each

!2 is 0 1

x+!2 is x, x+1

$ format as strings

,/ concatenate

. evaluate (convert to number)

K (ngn/k), 12 bytes

{.,/$x+!2}'!

Try it online!

K (ngn/k), 12 bytes

{.,/$x+!2}'!

Try it online!

! generate the list 0 1 ... n-1

{ } is a function with argument x

' applied to each

!2 is 0 1

x+!2 is x, x+1

$ format as strings

,/ concatenate

. evaluate (convert to number)

1
source | link

K (ngn/k), 12 bytes

{.,/$x+!2}'!

Try it online!