leak.js

var sys = require('sys')

function processAll (items, callback) {
    function next () {
        var item = items.pop()

        if(item == null)
            return callback() 
        
        processOne(item, function () {
            if(items.length % 1000 == 0)
                sys.puts("Remaining: " + items.length)
        
            next()
        })
    }
        
    next()
}
    
    
function processOne (item, callback) {
    // Simulate some work
    setTimeout(callback, 2)
}
    

var items = []
for (i = 0; i < 400000; i++)
    items.push(i)

processAll(items, function() {
    sys.puts("done")
})