gistfile1.js

function a(opt) {
     opt = 3+opt;
     return opt+1;
}

function b(opt) {
	'use strict';
     opt = 3+opt;
     return opt+1;
}

function c(opt) {
     'use strict';
     var _opt = 3+opt;
     return _opt+1;
}

function printStatus(fn) {
  switch(%GetOptimizationStatus(fn)) {
    case 1: console.log('Function is optimized'); break;
    case 2: console.log('Function is not optimized'); break;
    case 3: console.log('Function is always optimized'); break;
    case 4: console.log('Function is never optimized'); break;
    case 6: console.log('Function is maybe deoptimized'); break;
  }
}


a(5);
b(4);
c(6);

%OptimizeFunctionOnNextCall(a);
%OptimizeFunctionOnNextCall(b);
%OptimizeFunctionOnNextCall(c);

a(4);
printStatus(a);
b(5);
printStatus(b);
c(7);
printStatus(c);