How to avoid multiple variable re-declarations on function outputs in JavaScript

Question

Consider the following example

function doSomethingToAVariable(variable){
    return variable + 1
}

function doSomethingToAVariableASecondTime(variable){
    re         


        

Answer 1

In my humble opinion, your code is perfectly fine.

But, you can do something like this if you really want to "chain" the calls. It is a bit less efficient though.

function chainCalls(initVal, funcs){
  return funcs.reduce(function(val, f){
    return f(val);
  }, initVal || 0);
}

function doSomethingToAVariable(variable){
    return variable + 1
}

function doSomethingToAVariableASecondTime(variable){
    return variable + 2
}

function doSomethingToAVariableLastly(variable){
    return variable + 3
}

var myVariable = chainCalls(0, [doSomethingToAVariable,
                                doSomethingToAVariableASecondTime,
                                doSomethingToAVariableLastly]);

document.write(myVariable);

Another alternative is to create a reusable function chain like this.

function functionChain(){
  var funcs = arguments;
  return function(value){
    return Array.prototype.reduce.call(funcs, function(value, f){
      return f(value);
    }, value);
  };
}

function doSomethingToAVariable(variable){
    return variable + 1
}

function doSomethingToAVariableASecondTime(variable){
    return variable + 2
}

function doSomethingToAVariableLastly(variable){
    return variable + 3
}

var myVariable = functionChain(
  doSomethingToAVariable,
  doSomethingToAVariableASecondTime,
  doSomethingToAVariableLastly
)(0);

document.write(myVariable);