Compile and repeatedly execute JavaScript

Compiled scripts avoid parsing source on every execution. The bytecode remains owned by its original context and can be executed repeatedly. The script keeps that context alive.

Usage

js_script_run(script)

js_script_run_ref(script)

Arguments

script

A script created by ctx$compile(code).

Value

js_script_run() converts the result to R. js_script_run_ref() returns a JSValueRef owned by the script's context.

Details

Compilation does not execute the source. Compiled scripts cannot be passed as ordinary JavaScript values. For parameterised work, evaluate a JavaScript function with ctx$eval_ref() and call it repeatedly with js_ref_call().

Examples

ctx <- JSContext$new(profile = "bare")
ctx$eval("globalThis.value = 0")
#> [1] 0
script <- ctx$compile("value += 1; value")
js_script_run(script)
#> [1] 1
js_script_run(script)
#> [1] 2