Hi. I installed node.js 4.2.1(argon).
I noticed new key 'let' of ES6.
(https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Statements/let)
I understood that let use lower memory than 'var'. because let has block
scope, but 'var' has function scope.
So I tested memory usage of var and let.
But test result refer to 'var' uses lower memory than 'let'.
differences of rss, heapTotal, heapUsed value of 'let' is bigger than 'var'.
do I misunderstand 'let'?
Sorry for my english writting, I am english newbie.
below is my test code.
let.js
'use strict'
let pre = process.memoryUsage();
console.log('pre', pre);
function f() {
let obj = {x: 12};
return obj.x;
}
function test() {
for (let i =0;i<10000000000;i++) {
f();
}
}
test();
let post = process.memoryUsage();
console.log('post', post);
var.js
'use strict';
var pre = process.memoryUsage();
console.log('pre', pre);
function f() {
var obj = {x: 12};
return obj.x;
}
function test() {
for (var i =0;i<10000000000;i++) {
f();
}
}
test();
var post = process.memoryUsage();
console.log('post', post);
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