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Tail call optimization (TCO) not working in Safari

According to ES6 compatibility table , Safari has tail call optimization feature. Tried it and it fails just like any other browser. Am I missing something?

 function factorial(n, r = 1n) { return (n <= 1)? r: factorial(n - 1n, n * r) } console.log(factorial(36000n))

Safari output:

RangeError: Maximum call stack size exceeded.

You need to run your program in strict mode.

 "use strict"; function factorial(n, r = 1n) { return n <= 1n? r: factorial(n - 1n, n * r); } console.log(factorial(36000n).toString());

There are four conditions that need to be met in order for a function call to be considered a proper tail call.

  • The calling function is in strict mode .
  • The calling function is either a normal function or an arrow function.
  • The calling function is not a generator function.
  • The return value of the called function is returned by the calling function.

Source: ECMAScript 6 Proper Tail Calls in WebKit by Michael Saboff

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