local_variables.js

function doSomething() {
  var someValue = "this is an important value";
  anotherFuctionDefinedElsewhere();
}

function anotherFuctionDefinedElsewhere () {
  // this function can't access someValue
  console.log(someValue);
}

/// typically this can be easily solved by passing someValue into the function:

function doSomething() {
  var someValue = "this is an important value";
  anotherFuctionDefinedElsewhere(someValue);
}

function anotherFuctionDefinedElsewhere (someValue) {
  // now this function can access someValue
  console.log(someValue);
}

// Is there a way to have anotherFuctionDefinedElsewhere() access a local variable of doSomething() without passing?

if i understand correctly something like this might work:

function makeChangeableFunc(importantValue){
  return _.partial(changeableFunc(importantValue));
}

function changeableFunc(value, otherValue){
  return value + otherValue;
}

var fn = makeChangeableFunc("this is really important");

fn(", but this is just whatever."); // => "this is really important, but this is just whatever."
fn(", and so is this!"); // => "this is really important, and so is this!"

another way to pass values between functions defined separately

function doSomething() {
  this.someValue = "this is an important value";

  anotherFuctionDefinedElsewhere.apply(this);

}
function anotherFuctionDefinedElsewhere () {
    console.log(this.someValue);
}

doSomething();