R: Call a function with Some Arguments Forced

forceAndCall {base} | R Documentation

## Call a function with Some Arguments Forced

### Description

Call a function with a specified number of leading arguments forced before the call if the function is a closure.

### Usage

    forceAndCall(n, FUN, ...)

### Arguments

`n` | number of leading arguments to force.
`FUN` | function to call.
`...` | arguments to `FUN`.

### Details

`forceAndCall` calls the function `FUN` with arguments specified in `...`. If the value of `FUN` is a closure then the first `n` arguments to the function are evaluated (i.e. their delayed evaluation promises are forced) before executing the function body. If the value of `FUN` is a primitive then the call `FUN(...)` is evaluated in the usual way.

`forceAndCall` is intended to help defining higher order functions like `apply` to behave more reasonably when the result returned by the function applied is a closure that captured its arguments.

### See Also

`force`, `promise`, `closure`.

[Package base version 4.0.5 Index]