Tail calls elimination (ES6)

toa.js

// Tail call optimization

// this function call itself n times
function f(x) {
  // with every new call, new stack frame is created
  // there is a limit, this limit varies from engine to another, but there is a limit
  // this simple function breaks on chrome at f(100000)
  if (x < 1) {
    return 0
  }
  return f(x -1)
}
// fortunately ES6, guarantee "no stack consumption" for function invocations in tail call positions.
// https://www.ecma-international.org/ecma-262/6.0/#sec-tail-position-calls
// https://kangax.github.io/compat-table/es6/#test-proper_tail_calls_(tail_call_optimisation)
//------------------
// so by just adding   'use strict'; in engins that implemented this spec we get its binefits 
function g(x) {
  'use strict';
  // this simple function now works perfectly g(100000)
  if (x < 1) {
    return 0
  }
  return g(x -1)
}