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lib: refactor primordials.uncurryThis
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This is done to avoid creating an array and gain performance.

Co-authored-by: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>

PR-URL: #36221
Refs: https://v8.dev/blog/v8-release-80#optimizing-higher-order-builtins
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
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aduh95 authored and danielleadams committed Dec 7, 2020
1 parent 841e8f4 commit 617cb58
Showing 1 changed file with 5 additions and 11 deletions.
16 changes: 5 additions & 11 deletions lib/internal/per_context/primordials.js
Expand Up @@ -12,17 +12,11 @@
// `primordials.Object` where `primordials` is a lexical variable passed
// by the native module compiler.

const ReflectApply = Reflect.apply;

// This function is borrowed from the function with the same name on V8 Extras'
// `utils` object. V8 implements Reflect.apply very efficiently in conjunction
// with the spread syntax, such that no additional special case is needed for
// function calls w/o arguments.
// Refs: https://github.com/v8/v8/blob/d6ead37d265d7215cf9c5f768f279e21bd170212/src/js/prologue.js#L152-L156
function uncurryThis(func) {
return (thisArg, ...args) => ReflectApply(func, thisArg, args);
}

// `uncurryThis` is equivalent to `func => Function.prototype.call.bind(func)`.
// It is using `call.bind(bind, call)` to avoid using `Function.prototype.bind`
// after it may have been mutated by users.
const { bind, call } = Function.prototype;
const uncurryThis = call.bind(bind, call);
primordials.uncurryThis = uncurryThis;

function copyProps(src, dest) {
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