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Can Promise load multi urls in order?


Can Promise load multi urls in order?

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Can Promise load multi urls in order?
Tag : javascript , By : CrimsonGore
Date : November 29 2020, 09:01 AM

Hope this helps promise then return a specified promise gives the following code snippet: , Using Normal Promise Syntax
Chain Promises
get('a.json').then(function(a) {
    return get('b.json');
}).then(function(b){
    return get('c.json');
}).then(function(c) {
    // all done here
}), function(err) {
    // error here
});
async function someFunction() {
    let a = await get('a.json');
    let b = await get('b.json');
    // do something with a and b here
    return something;
}

someFunction().then(result => {
    // all done here
}).catch(err => {
    // error here
});
Promise.all([get('a.json'), get('b.json'), get('c.json')]).then(function(results) {
    // all done with results here
}, function(err) {
    // error here
});
['a.json', 'b.json', 'c.json'].reduce(function(p, item) {
    return p.then(function(){
        // process item here
    });
}, Promise.resolve()).then(function(result) {
    // all done here
}, function(err) {
    // error here
});
Promise.map(['a.json', 'b.json', 'c.json'], function(item) {
    // do some operation on item and return data or a promise
    return something;
}).then(function(results) {
    // all done
}, function(err) {
    // error here
});
function get(url) {
    function pget(u) {
        var p = this.then(function (result) {
            log(result);
            return get(u);
        });
        p.get = pget;
        return p;
    }
    var p = new Promise(function (resolve, reject) {
        setTimeout(function() {
            resolve(url);
        }, 500);
    });
    p.get = pget;
    return p;
}

get('a.json').get('b.json').get('c.json').then(function(result) {
    log(result);
    log("done");
}, function(err) {
    log("err");
});

function log(x) {
    var div = document.createElement("div");
    div.innerHTML = x;
    document.body.appendChild(div);
}
function delay(url) {
    return new Promise(function (resolve, reject) {
        setTimeout(function() {
            log(url);
            resolve(url);
        }, 500);
    });
}

function get(url) {
    
    function pget(u) {
        if (!u) {
            return this.promise;
        } else {
            return {promise: this.promise.then(function() {
                return delay(u);
            }), get: pget}
        }
    }
    
    return {promise: delay(url), get: pget};
}

// note the empty .get() right before the .then()
// the empty .get() at the end is required in this scheme
get('a.json').get('b.json').get('c.json').get().then(function(result) {
    log("done");
}, function(err) {
    log("err");
});


function log(x) {
    var div = document.createElement("div");
    div.innerHTML = x;
    document.body.appendChild(div);
}

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URLLoader loads multi files and the result order is the same as call load()


Tag : actionscript-3 , By : Kbotei
Date : March 29 2020, 07:55 AM
I wish this help you Since URLLoader is async, how to make sure the order of data from server side is the same as the loader.load() call? In other words, the data order in totalResults is the same order of url-related content? , You can extend URLLoader class functionality.
dynamic class DynamicURLLoader extends URLLoader { }
 var urlLoader:DynamicURLLoader  = new DynamicURLLoader();
 urlLoader.index = ...
var loader:DynamicURLLoader = DynamicURLLoader(event.target);
totalResults[ loader.index ] = loader.data;

Promise catch() order in complex promise return chain


Tag : javascript , By : RichAA
Date : March 29 2020, 07:55 AM
To fix this issue When using promises, a function should do one of three things:
Return a value Return a promise Throw an error
function post() {
  foo.bar; // will throw
}

function run() {
  post()
    .then(log)
    .catch(log);
}
ReferenceError: foo is not defined
    at post (sync.js:6:3)
    at run (sync.js:10:3)
    at Object.<anonymous> (sync.js:15:1)
function post() {
  return new Promise((resolve, reject) => {
    reject('foo');
  });
}

function run() {
  post()
    .then(() => {})
    .catch((err) => {
      console.error('Caught error:', err);
    });
}
function post() {
  return new Promise((resolve, reject) => {
    resolve('foo');
  });
}

function run() {
  post()
    .then((result) => {
      throw result;
    })
    .catch((err) => {
      console.error('Caught error:', err);
    });
}

Google Analytics is showing I have slow load time on certain URLs. When I load the URLs, they load extremely fast. Why?


Tag : google-analytics , By : Al Dimond
Date : March 29 2020, 07:55 AM
this will help It's hard to give an exact answer since there are so many factors that could come into play. You can first start with running online website performance tools like:
tools.pingdom.com

jQuery promise execution order differs from javascript promise


Tag : javascript , By : Icyflash
Date : March 29 2020, 07:55 AM
hope this fix your issue jQuery 2 does not support Promises/A+, and cannot assimilate promises from other implementations ("thenables"). The native promise that is returned from the callback and resolves the outer promise is not being awaited, but rather used as the immediate fulfillment value. You can see this by inspecting the argument passed to your final callback.
return $.Deferred(def => promise.then(def.resolve, def.reject)).promise()

Order of promise array in Promise.allSettled and order in which database transactions are created?


Tag : javascript , By : rhinojosa
Date : March 29 2020, 07:55 AM
may help you . indexedDB will maintain the order of the transactions in order created, except when those transactions do not overlap (e.g. do not involve the same store out of the set of stores each one involves). this is pretty much regardless of what you do at the higher promise layer.
at the same time, maybe it is unwise to rely on that behavior, because it is implicit and a bit confusing. so maybe it is ok to linearize with promises. the only reach catch is when you need maximum performance, which I doubt applies.
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