Message from JavaScript discussions

— When you run loops with different context, the functional perf is not guaranteed. "normal" loop has stable perf

Message permanent page

— It's guaranteed with proper tail calls

— That's irrelevant for these cases, there is no inlining going on in the loop nor in the recursive definition

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— Inlining is the matter of optimizing compiler, you may make a hint but you dont control it.

— I know, but there is nothing to inline in these examples

— I'll post the code I used

— 

'use strict';

let sum = 0;

console.time('loop');
for (let i = 0; i < 100000000; ++i) {
  sum += i;
}
console.log(sum);
console.timeEnd('loop');

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— 

'use strict';

const sum = (i, acc) =>
  i < 100000000
    ? sum(i + 1, i + acc)
    : acc;

console.time('ptc');
console.log(sum(0, 0));
console.timeEnd('ptc');

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— Definitly, it will be inlined

— How?

— It can't