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GeezerVison is showing github.com — JavaScript/Asynchronous-JavaScript/AsyncAwait.js at master · lgope/JavaScript

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AsyncAwait.js

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// In ES6 to consume promises syntax can still be quite confusing and difficult to manage.And, so in ES8, or ES2017, something alled Async/Await was introduced to the JavaScript language.
const getIDs = new Promise((resolve, reject) => {
setTimeout(() => {
resolve([523, 883, 432, 974]);
}, 1500);
});
const getRecipe = recID => {
return new Promise((resolve, reject) => {
setTimeout(ID => {
const recipe = {
title: 'Fresh tomato Pasta',
Publisher: 'Lakshman'
};
resolve(`${ID}: ${recipe.title}`);
}, 1500, recID);
});
};
const getRelated = Publisher => {
return new Promise((resolve, reject) => {
setTimeout(pub => {
const recipe = {
title: 'American Pizza',
Publisher: pub
};
resolve(`${pub}: ${recipe.title}`);
}, 1500, Publisher);
});
};
/*
// this then method allows us to add an event handler for the case that the promise is fulfilled. So which means that there is a result.
getIDs
.then(IDs => { // so this argument here will be the result of the successful promise.
console.log(IDs); // [ 523, 883, 432, 974 ]
return getRecipe(IDs[2]);
})
.then(recipe => {
console.log(recipe); // 432: Fresh tomato Pasta
return getRelated('Lakshman Gope');
})
.then(recipe => {
console.log(recipe); // Lakshman Gope: American Pizza
})
// if the promise rejected then catch method will catch the error.
.catch(error => {
console.log('Error: ' + error);
}); */
// it's good to remember that async function always returns a promise.
async function getRecipeAW() {
const IDs = await getIDs;
console.log(IDs); // [ 523, 883, 432, 974 ]
const recipe = await getRecipe(IDs[2]);
console.log(recipe); // 432: Fresh tomato Pasta
const related = await getRelated('Lakshman Gope');
console.log(related); // Lakshman Gope: American Pizza
return recipe;
}
getRecipeAW().then(result => console.log(`${result} is the best ever!`)); // 432: Fresh tomato Pasta is the best ever!
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