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Chris Tateandejc3
45d3d02bf0
A generic arrow or function expression bound inside a function or method compiles when it uses nothing from the enclosing function's frame: no `this`, `super`, `arguments` or `new.target`, and no local, parameter or type parameter of an enclosing function. Its instantiations are module functions, as for a module-scope binding, and may call the binding itself and read module-scope bindings. Instances of bindings in functions and blocks take the declaration's position in their names, so two functions may declare bindings of the same name. Bindings that use the enclosing frame keep their SC1090 fence. Fixes #1624 Co-authored-by: ejc3 <1694850+ejc3@users.noreply.github.com>
34 lines
1.2 KiB
TypeScript
34 lines
1.2 KiB
TypeScript
// Generic arrow and function-expression bindings declared inside functions
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// and methods that use nothing from the enclosing frame compile like
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// module-scope bindings: each call instantiates them, they may call
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// themselves and read module-scope bindings, and two functions may declare
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// bindings of the same name.
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function append(): void {
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const put = <T>(xs: T[], x: T): T[] => [...xs, x];
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console.log(put([1, 2], 3).join(","), put(["a"], "b").join(","));
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}
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append();
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const LIMIT = 3;
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function prepend(): void {
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const put = <T>(xs: T[], x: T): T[] => [x, ...xs];
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console.log(put([1], 0).join(","));
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const twice = function <T>(x: T): T[] {
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return [x, x];
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};
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console.log(twice("z").join(","), twice(7).length);
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const count = <T>(xs: T[], n: number): number => (n <= 0 ? xs.length : 1 + count(xs, n - 1));
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console.log(count([1], 3));
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const firstFew = <T>(xs: T[]): T[] => xs.slice(0, LIMIT);
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console.log(firstFew([1, 2, 3, 4]).join(","), firstFew(["p", "q"]).join(","));
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}
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prepend();
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class Box {
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run(): string {
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const wrap = <T>(x: T): { v: T } => ({ v: x });
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return JSON.stringify([wrap(1), wrap("s"), wrap([true])]);
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}
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}
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console.log(new Box().run());
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