Pipe a possibly unresolved value forward into a function. The piped expression
should be wrapped in .().
x %>>% f
.(expr)a 'mirai' or mirai value at $data that is possibly an
'unresolvedValue'.
a function that accepts 'x' as its first argument.
a piped expression.
The evaluated result, or if the mirai value of x is an 'unresolvedValue', an 'unresolvedExpr'.
It is advisable to wrap resolve() around a piped expression to
ensure stability of return types, as this is guaranteed to return either
an 'unresolvedExpr' or 'resolvedExpr'.
An 'unresolvedExpr' encapsulates the eventual evaluation result.
Query its $data element for resolution. Once resolved, the object
changes into a 'resolvedExpr' and the evaluated result will be available
at $data.
Supports stringing together a series of piped expressions (as per the below example).
Wrap a piped expression in .() to ensure that the return value is
always an 'unresolvedExpr' or 'resolvedExpr' as the case may be,
otherwise if 'x' is already resolved, the evaluated result would be
returned directly.
unresolved may be used on an expression or its $data
element to test for resolution.
Usage is similar to R's native |> pipe.
x %>>% f is equivalent to f(x)
x %>>% f() is equivalent to f(x)
x %>>% f(y) is equivalent to f(x, y)
Please note that other usage is not supported and it is not a drop-in
replacement for magrittr's %>% pipe.
if (interactive()) {
# Only run examples in interactive R sessions
m <- mirai({Sys.sleep(0.5); 1})
b <- .(m %>>% c(2, 3) %>>% as.character)
unresolved(b)
b
b$data
call_mirai(m)
unresolved(b)
b
b$data
}