Read from stdin

[Tarrasch]

If no arguments are given it would be nice if the function just assumed it should read form stdin. Like this

$ echo 1 2 3 4 5 | mapa '3*$1' | filtera '$1%2 == 0' | folda '$1+$2' 0
27

(3+9+15 = 27)

[Tarrasch]

Another use case I just thought of is the desired laziness. Like now you can only combine these function by passing arguments with $(command), for instance

mapa '$1/2' $(each 'heavy-function $1' {1..15})

But that will be strict in the second argument to mapa because the shell arguments are inherently strict. The file descriptors are not though, so that's why I highly value reading from stdin.

Furthermore, the $() will mess up the syntax highligthing I have in zsh.