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If you think of our timer, data being returned from an API or someone giving access to a webcam, when we request or start those things, what we often get in return is not the immediate data back, because those things take time. Promises are an IOU (I Owe You) for something that will happen in the future. The solution to callback hell is to use a promise, and although we haven't covered that yet, we will now.
#Javascript promise code
In the Past - Sharing JavaScript Code between Files.Module 14 - ES Modules and Structuring Larger Apps Formatting Currency using Number Format API.Handling Errors with Higher Order Functions.Refactoring Callback Hell to Promise Land Part 69.The Event Loop and Callback Hell Part 66.Prototype Refactor of the Slider Exercise Part 64.Prototypes and Prototypal Inheritance Part 63.Prototype Refactor of Gallery Exercise Part 62.Module 11 - Prototypes, this, new and Inheritance Shopping Form with Custom Events, Delegation and Localstorage Part 57.Looping and Iterating - for, for in, for of, and while Loops Part 54.Looping and Iterating - Reduce Exercise Part 53.Looping and Iterating - Filter, Find and Higher-Order Functions Part 51.Looping and Iterating - Mapping Part 50.Looping and Iterating - Array forEach Part 49.Array Cardio - Callback Methods and Function Generation Part 48.Array Cardio - Instance Methods Part 47.Case Switch and Animating a Turtle with CSS Variables Part 40.Coercion, Ternaries and Conditional Abuse Part 39.If Statements, Function Returns, Truthy and Falsy Part 38.Scroll Events and Intersection Observer Part 35.Accessibility Gotchas and Keyboard Codes Part 32.Prevent Default and Form Events Part 31.Targets, Bubbling, Propagation and Capture Part 30.Listening to events on multiple elements.Properties to work with Nodes and Elements.The difference between a Node and an Element.document.createRange() and document.createFragment().Built-in and Custom Data Attributes Part 24.insertAdjacentText and insertAdjacentElement.Searching Inside Already Selected Elements.Where to Load JavaScript When Selecting Elements.Different Ways to Write Arrow Functions.What is the difference between a function declaration and a function expression?.Different Ways to Declare Functions Part 15.
#Javascript promise how to
How to Fall Back on Default for Only One Parameter.Functions - Parameters and Arguments Part 14.
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There are 6 static methods of Promise class: In practice, this method is almost never used. Let promise = new Promise((resolve, reject) => reject(error))