Learning JavaScript Promises

Introducing Promises 3 lectures 15:44 The Course Overview This video will offer an overview of the course. Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Introducing Promises 3 lectures 15:44 The Course Overview This video will offer an overview of the course. Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

The Course Overview This video will offer an overview of the course. The Course Overview This video will offer an overview of the course. The Course Overview This video will offer an overview of the course. The Course Overview This video will offer an overview of the course. This video will offer an overview of the course. This video will offer an overview of the course. Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Promises – You've Been Using Them All Along Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Many processes in JavaScript are asynchronous and, thus, can be confusing for developers whose experience is mostly synchronous. Promise objects allow for a clear way to handle such processes.

• Asynchronous objects can be launched and represented by deferred objects
• Their outcome can be handled represented with the help of promise objects
• The API data can be displayed on the screen using $http

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Make Me a Promise Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Some services ($http) return promise objects when called, but other processes do not. Often, a developer will need to create their own asynchronous process, such as waiting for some user interactions or the completion of a navigator action. The $q service provides the tool to handle such cases.

• Create a new deferred object with the help of $q.defer
• Launch an asynchronous action
• Use the corresponding promise object to handle the outcome of the action

Resolving and Rejecting ES6 Promises 6 lectures 53:43 Creating ES6 Promises Promises have become so popular that the new iteration of JavaScript ES6 implements them. This implementation is slightly different than the Angular $q service. We will learn how to create promises using the ES6 promises API.

• Create an executor
• Create an promise with this executor
• Use the two parameters callbacks

There Are Only Two Types of Promises in This World Promises allow us to code parts of an asynchronous flow. Flows rarely follow a single direction; there are cases where things go awry. Promises prepare for these instances by having two possible outcomes: success and failure.

• Plan an asynchronous flow
• Using reject to signal a failure and resolve to signal a success
• Handle what’s next in both cases

Deciding What’s Next Asynchronous process flows that are handled by promises are all about clarity of code and outcomes. Here, we will learn about the various ways to set callbacks for each case:

success only

failure only

both success and failure

Fulfilling promises is similar to a try catch clause; Angular added the .finally callback to handle a case where something needs to be done regardless of success or failure.

• Use .then for success only or success + failure
• Use .catch for rejection only
• Understand Angular’s .finally callback

No Second Chance Some processes and flows require repeated information to be passed at unexpected times. Other flows, though of an unknown duration, expect their outcome to be final. Promises do not allow for second chances and, thus, are great tools to cover the latter of these cases.

• Attempt to reject an already resolved promise or change the resolution value of a promise
• Only a single value can be passed as a resolution value and this is why it's not a problem
• Use the finality of a settlement to our advantage

Callbacks Execution and Timing A lot of processes will need to conduct more than one task upon completion of an action. Although promises are strongly single-chance and single-value, when it comes to the callbacks, developers can add as many as they want, even after the promise has been settled, and, thus, allow for several actions to be added from various parts of an application.

• Adding several callbacks on a promise and review their execution order
• The paths that will not be walked
• Add callbacks after a promise has settled

The Future Is Coming – Angular v2 Promises Angular 2 is coming and has everyone guessing with its breaking changes and new features. We will review where promises stand in that major overhaul.

• Install dependencies and gulp
• Add a constructor on component
• Use fetch to perform an AJAX call

Resolving and Rejecting ES6 Promises. 6 lectures 53:43 Creating ES6 Promises Promises have become so popular that the new iteration of JavaScript ES6 implements them. This implementation is slightly different than the Angular $q service. We will learn how to create promises using the ES6 promises API.

• Create an executor
• Create an promise with this executor
• Use the two parameters callbacks

There Are Only Two Types of Promises in This World Promises allow us to code parts of an asynchronous flow. Flows rarely follow a single direction; there are cases where things go awry. Promises prepare for these instances by having two possible outcomes: success and failure.

• Plan an asynchronous flow
• Using reject to signal a failure and resolve to signal a success
• Handle what’s next in both cases

Deciding What’s Next Asynchronous process flows that are handled by promises are all about clarity of code and outcomes. Here, we will learn about the various ways to set callbacks for each case:

success only

failure only

both success and failure

Fulfilling promises is similar to a try catch clause; Angular added the .finally callback to handle a case where something needs to be done regardless of success or failure.

• Use .then for success only or success + failure
• Use .catch for rejection only
• Understand Angular’s .finally callback

No Second Chance Some processes and flows require repeated information to be passed at unexpected times. Other flows, though of an unknown duration, expect their outcome to be final. Promises do not allow for second chances and, thus, are great tools to cover the latter of these cases.

• Attempt to reject an already resolved promise or change the resolution value of a promise
• Only a single value can be passed as a resolution value and this is why it's not a problem
• Use the finality of a settlement to our advantage

Callbacks Execution and Timing A lot of processes will need to conduct more than one task upon completion of an action. Although promises are strongly single-chance and single-value, when it comes to the callbacks, developers can add as many as they want, even after the promise has been settled, and, thus, allow for several actions to be added from various parts of an application.

• Adding several callbacks on a promise and review their execution order
• The paths that will not be walked
• Add callbacks after a promise has settled

The Future Is Coming – Angular v2 Promises Angular 2 is coming and has everyone guessing with its breaking changes and new features. We will review where promises stand in that major overhaul.

• Install dependencies and gulp
• Add a constructor on component
• Use fetch to perform an AJAX call

Creating ES6 Promises Promises have become so popular that the new iteration of JavaScript ES6 implements them. This implementation is slightly different than the Angular $q service. We will learn how to create promises using the ES6 promises API.

• Create an executor
• Create an promise with this executor
• Use the two parameters callbacks

Creating ES6 Promises Promises have become so popular that the new iteration of JavaScript ES6 implements them. This implementation is slightly different than the Angular $q service. We will learn how to create promises using the ES6 promises API.

• Create an executor
• Create an promise with this executor
• Use the two parameters callbacks

Creating ES6 Promises Promises have become so popular that the new iteration of JavaScript ES6 implements them. This implementation is slightly different than the Angular $q service. We will learn how to create promises using the ES6 promises API ttled, and, thus, allow for several actions to be added from various parts of an application.

• Adding several callbacks on a promise and review their execution order
• The paths that will not be...