How to use NodeJS Async (https://caolan.github.io/async/) as normal for-cycle?
for(var i = 0; i < 100; i++){
doSomething();
}
I need serial flow but normal for-cycle not waiting until action is finished.
I am open to ES6 solutions, if any.
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3 Answers
You can try to use Async/Await from ES6 which is cleaner and common shared in many standards. And in addition you don't need any dependencies from third party
const forLoopiNSeria = async () => {
for(var i = 0; i < 10; i++){
console.log(await doSomething(i))
}
}
function doSomething(index) {
return new Promise( (resolve, reject) => {
setInterval(() => resolve(index), 500)
})
}
forLoopiNSeria()
2 Comments
EmaMaMaso EmaSeMa
Working as well. This is maybe better answer, because code is cleaner. Thanks
yue you
Glad I can help you
I believe you could always do something like this:
function asyncWhile(condition, action, ctx) {
const whilst = function(data) {
return condition.call(ctx, data) ?
Promise.resolve(action.call(ctx, data)).then(whilst) :
data;
}
return whilst();
}
let i = 1
asyncWhile(
() => {
if (i <= 100) {
i += 1
return true
}
return false
},
() => {
console.log(`iteration ${i}`)
},
)
2 Comments
EmaMaMaso EmaSeMa
I don't understand can you please add example of usage?
EmaMaMaso EmaSeMa
TypeError: condition.call is not a function
I found another way with usage of until function from async:
var i = 0;
var max = 100;
async.until(() => {
i++;
return i === max-1;
}, function (callback) {
//doMagic()
callback();
}, function () {
console.log("Finished");
});