I have a problem with callback function. I want write a function, who can iterate the object (i want use a callback method), but it's not working and i don't know what is wrong with this.
I'll be glad from any help.
services = [
{
name: "a",
},
{
name: "b"
}
]
function Service (data) {
this.name = data.name
}
function getData (i) {
sample = new Service(services[i])
console.log(sample)
}
getData(0) /* this function work*/
function getAll(index, count, callback) {
service = new Service(services[index]);
console.log(service)
if (index < count) {
callback(index + 1, count, getAll)
}
}
getAll (0, services.length, getAll) /* this function is not working */
The problem is the
getAll (0, services.length, getAll)
services.length return the length of an array, but arrays start at position 0
to fix this error use
getAll (0, services.length-1, getAll)
The error you get is due to calling services[2] that doesn't exists. This getAll function below solves your problem
function getAll(index, count, callback) {
if (index < count) {
service = new Service(services[index]);
console.log(service)
callback(index + 1, count, getAll)
}
}
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