While Loop — nv_while • anvl

Executes a functional while loop.

Usage

nv_while(init, cond, body)

Arguments

init: (list())
Named list of initial state values.
cond: (function)
Condition function returning a scalar boolean. Receives the state values as arguments.
body: (function)
Body function returning the updated state as a named list with the same structure as init.

Value

Final state after the loop terminates (same structure as init).

See also

prim_while() for the underlying primitive.

Examples

nv_while(
  init = list(i = nv_scalar(0L), total = nv_scalar(0L)),
  cond = function(i, total) i < 5L,
  body = function(i, total) list(
    i = i + 1L,
    total = total + i
  )
)
#> $i
#> AnvlArray
#>  5
#> [ CPUi32{} ] 
#> 
#> $total
#> AnvlArray
#>  10
#> [ CPUi32{} ] 
#>