Run results for: globals vs. upvalues: immutable

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0.1 Waterfox/56.0.1

Browser: Firefox 56

Operating system: Windows 7

Device Platform: Other

Date tested: 2025 years ago

Test name	Executions per second
g	177907200.0 Ops/sec
g2	178045200.0 Ops/sec
l	137422900.0 Ops/sec
s1	25883000.0 Ops/sec

HTML Preparation code:

<script>
'use strict';

const l = (function() {
  'use strict';
  const localObj = `foobar`;
  return function() {
    return localObj[3];
  };
})();

Function(`return this`)().globalObj = `foobAr`;

const g = function() {
  'use strict';
  return globalObj[3];
};

Object.defineProperty(
	Function(`return this`)(),
	`globalObj2`,
	{value : `fooBar`, __proto__ : null,});

const g2 = function() {
  'use strict';
  return globalObj2[3];
};
  
const s1 = function() {
  'use strict';
  return Symbol.for('foobar');
};

var rv = ``;
var rv2;

</script>

Tests:

g
rv = g();
g2
rv = g2();
l
rv = l();
s1
rv2 = s1();