How to write a function "inOrder" that accepts two callbacks and invokes them in order.

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How to Implement "inOrder" using the callback pattern and using Promises.

var logOne = setTimeout(function() {
    console.log("one!");
    }, Math.random() * 1000);

var logTwo = setTimeout(function() {
    console.log("two!");
    }, Math.random() * 1000);

inOrder(logOne, logTwo);

// one // two

// it should always log those two in order regardless of their timing

Its impossible with setTimeout directly as you cant do delays etc. But you could create a wrapper that provides a few more options:

 function timer(cb, ms) {
   let start = +new Date;
   let timeout = setTimeout(cb, ms);

  return {
    ms,
    stop() {
      if(!timeout) return;
      clearTimeout(timeout);
      ms -= (start - new Date);
      timeout = null;
   },

   start() {
      if(ms > 0 && !timeout) {
        start = +new Date;
        timeout = setTimeout(cb, ms);
      }
   },
   delay(time) {
     this.stop();
     ms += time;
     this.start();
   }
 };
}

So now it is quite easy:

 function inOrder(a, b) {
   if(a.ms > b.ms)
     b.delay(a.ms - b.ms);
 }

Usable as:

 const one = timer(() => console.log("one"), 1000);
 const two = timer(() => console.log("two"), 500);

 inOrder(one, two);

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Create two function logOne & logTwo and can resolve them using Promise.resolve

function logOne() {
  setTimeout(function() {
    console.log("one!");
  }, Math.random() * 1000);
}

function logTwo() {
  setTimeout(function() {
    console.log("two!");
  }, Math.random() * 5000);
}

function inOrder(a, b) {
  Promise.resolve(a()).then(b())
}
inOrder(logOne, logTwo);

Write a Function Rule: An Application (Algebra I), 5.4: Writing a Function Rule. CCSD102. Loading Unsubscribe from CCSD102? Cancel Duration: 14:25 Posted: Feb 10, 2012 To create a function in R, you will make and transform an R script. The best way to learn to swim is by jumping in the deep end, so let’s just write a function to show you how easy that is in R. Make the script in R Suppose you want to present fractional numbers […]

A friend of mine has asked me to help him with this one.

So first thing is you won't make it work unless you can use nodejs. In nodejs setTimeout returns Timer object, which (with a little hacky code) you can use to make it work.

Inside browser it's impossible without creating some kind of a wrapper around those functions. @Jonas Wilms has already showed it, so let me show you my hacky implementation:

var logOne = setTimeout(function () {
  console.log('one!');
}, 5000);

var logTwo = setTimeout(function () {
  console.log('two!');
}, 0);

function inOrder(logOne, logTwo) {
  var logTwoCallback = logTwo._onTimeout;
  clearTimeout(logTwo);

  setTimeout(function checkTimeout() {
    if (logOne._called) {
      logTwoCallback();
    } else {
      setTimeout(checkTimeout, 0);
    }
  }, 0);
}

inOrder(logOne, logTwo);

5.4: Writing a Function Rule, The goal of this lesson is to write a function rule using a table, trial and error, and also the concept of slope. You write functions with the function name followed by the dependent variable, such as f(x), g(x) or even h(t) if the function is dependent upon time. You read the function f(x) as "f of x" and h(t) as "h of t". Functions do not have to be linear. The function g(x) = -x^2 -3x + 5 is a nonlinear function.

Write a Function Rule, This video shows how functions typically behave, and how to write them down. Functions Duration: 4:13 Posted: Apr 24, 2018 This means you type your function's name and the values you want to assign to the inputs. Test your function with the input value of 4, 5 and 6. That means on the command prompt you would write slope Equation(4,5,6).

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What is a function? (video) | Functions, Hi, there is this one problem in the exercise "Write function rules from equations" that I am Duration: 3:04 Posted: Jun 25, 2015 Writing a Function procedure. 12/26/2018; 2 minutes to read; In this article. A Function procedure is a series of Visual Basic statements enclosed by the Function and End Function statements. A Function procedure is similar to a Sub procedure, but a function can also return a value.

Comments
  • logOne and logTwo are no callbacks, they are return values from setTimeout.
  • Its impossible to do anything with the timer id ...
  • function inOrder(a, b) { a(); b(); } does solve the task from your question title, but that doesn't cope with a being asynchronous. If you want to wait for an asynchronous result from a before invoking b, then a either has to accept a callback or return a promise.
  • How to do it using callbacks not Promises.
  • This is incorrect. Run this a few times and you will get "two! one!". I'll elaborate more in my response.