Can anyone recommend some valuable resources or books that explain how to effectively manage multiple asynchronous requests?
Consider the code snippet below:
Payment.createToken = function(data) {
var data = data;
apiCall("POST", "api/createToken", data, function(success, response) {
if (success) {
data.token = response.id;
if (data.coupon) {
Payment.verifyCoupon(data);
} else {
Payment.chargePlan(data);
}
} else {
// Handle error
}
});
};
Payment.verifyCoupon = function(data) {
var data = data;
apiCall("POST", "/api/checkCoupon", data, function(success, response) {
if (success) {
Payment.chargePlan(data);
} else {
// Handle error
}
});
};
Payment.chargePlan = function(data) {
apiCall("POST", "/api/chargePlan", data, function(success, response) {
if (success) {
Payment.changeUserType(data);
} else {
// Handle error
}
});
};
Payment.changeUserType = function(data, response) {
apiCall("PUT", "api/users/", data, function(success, response) {
if (success) {
// User type changed successfully
} else {
// Handle error
}
});
};
As you can see, this process involves 4 steps and it's quite lengthy. How can I efficiently handle errors in this scenario? Also, how can I ensure that these calls are reusable whenever needed?