promise.js
function ToLength ( argument ) {
    var len = ToInteger(argument);
    return len <= 0 ? 0 : Math.min(len, Math.pow(2, 53) - 1);
  }
function ToLength ( argument ) {
    var len = ToInteger(argument);
    return len <= 0 ? 0 : Math.min(len, Math.pow(2, 53) - 1);
  }
function ToLength ( argument ) { var len = ToInteger ( argument ) ; return len <= 0 ? 0 : Math . min ( len , Math . pow ( 2 , 53 ) - 1 ) ; }
7.1.15 ToLength
7 . 1 . 15 ToLength