Promise
Contents:
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Understanding promises in JavaScript
Our Word of the Year justice , plus 10 more. How we chose 'justice'.
And is one way more correct than the others? How to use a word that literally drives some people nuts. The awkward case of 'his or her'. Identify the word pairs with a common ancestor. Test your vocabulary with our question quiz! Synonyms for promise Synonyms: Noun oath , pledge , troth , vow , word Synonyms: Verb covenant , pledge , swear , vow Visit the Thesaurus for More.
Requirements
Examples of promise in a Sentence Noun She gave me her promise. She never made a promise that she didn't intend to keep. There is little promise of relief in the forecast.
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They were attracted by the promise of success. Verb Promise me that you won't tell anyone. I can't promise you that I'll be able to go, but I'll do my best.
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If you pass it a value then it returns a Promise for that value. If you pass it something that is close to a promise such as a jQuery attempt at a promise it returns a Promise that takes on the state of value rejected or fulfilled.
The Promise object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value. The www.farmersmarketmusic.com(iterable) method returns a single Promise that resolves when all of the promises in the iterable argument have resolved or.
Returns a promise for an array. If it is called with a single argument that Array. Takes a function which accepts a node style callback and returns a new function that returns a promise instead.
Promises/A+
The twin to denodeify is useful when you want to export an API that can be used by people who haven't learnt about the brilliance of promises yet. If the last argument passed to module. It explains things very clearly so I recommend you read it.
Either onFulfilled or onRejected will be called and they will not be called more than once. They will be passed a single argument and will always be called asynchronously in the next turn of the event loop.
Promises for asynchronous programming
If the promise is fulfilled then onFulfilled is called. If the promise is rejected then onRejected is called. If the handler that is called returns a promise, the promise returned by. If the handler that is called returns a value that is not a promise, the promise returned by.
- What is a promise?!
- Jean-Jacques Rousseau (German Edition);
- Shades of the Gods (The Elysium Legacies Book 1).
- Promise | Definition of Promise by Merriam-Webster!
- B for Baby (Modern Plays)!
- Terminology.
- Memories of You;
If x is a thenable, it attempts to make promise adopt the state of x , under the assumption that x behaves at least somewhat like a promise. Otherwise, it fulfills promise with the value x.
Motivation
To run [[Resolve]] promise, x , perform the following steps:. If a promise is resolved with a thenable that participates in a circular thenable chain, such that the recursive nature of [[Resolve]] promise, thenable eventually causes [[Resolve]] promise, thenable to be called again, following the above algorithm will lead to infinite recursion. Implementations are encouraged, but not required, to detect such recursion and reject promise with an informative TypeError as the reason.
In practice, this requirement ensures that onFulfilled and onRejected execute asynchronously, after the event loop turn in which then is called, and with a fresh stack.