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programming async trick.
// Environment: NodeJS
// Lets suppose that you have a collection of items, and your function must persist all items using the
//database.insert(item, callback ) function. When you finish the task, you should call the callback function.
// If one item raise a error, the callback(err) must be called and never call the callback anymore.
function saveBulk(items, callback) {
// Your code here
saveBulk([ {name:"thiago"}, {name: "r42"}, { name: "rulio"} , { name: "nodejs"} ], function(err) {
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