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by oneearedrabbit
376 days ago
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Decades ago, a closure in Forth was especially innovative with DOES>: : COUNTER
CREATE ,
DOES> DUP 1 SWAP +! @ ;
0 COUNTER PK
PK . \ => 1
PK . \ => 2
A semi-equivalent in Javascript is: const counter = init => {
let x = init;
return () => { x += 1; return x; };
};
const pk = counter(0);
console.log(pk()); // => 1
console.log(pk()); // => 2
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