Finding mode and median in Javascript error - mode

Question

I have been working on a coderbyte problem for the past two days. I thought I finally had it buy for some reason this I keep getting an error.
function comparemedianandmode(arr){
function findmode(arr){
mapping = {};
mode = 0;
for(var i = 0; i < arr.length; i++){
if(!mapping[arr[i]]){
mapping[arr[i]] = 0;
}
mapping[arr[i]] += 1;
}
for(prop in mapping){
if(mapping[prop] > mode){
var mode = parseInt(prop);
}
}
}
function findmedian(arr){
arr.sort(function(a,b){return a - b});
if(arr.length % 2 === 0){
var median = (arr[(arr.length/2)-1] + arr[arr.length/2])/2;
}
else{
var median = arr[(arr.length - 1)/2];
}
}
var answer = (median === mode) ? 1 : 0;
return answer
}
When I try comparemedianandmode([1,2,3,3,3,4,5]) I get the following error:
ReferenceError: median is not defined
Must be something simple, but I can't seem to figure it out
EDIT
New Code:
function comparemedianandmode(arr){
var mode;
var median;
function findmode(arr){
mapping = {};
for(var i = 0; i < arr.length; i++){
if(!mapping[arr[i]]){
mapping[arr[i]] = 0;
}
mapping[arr[i]] += 1;
}
for(prop in mapping){
if(mapping[prop] > mode){
var mode = parseInt(prop);
}
}
}
var median
function findmedian(arr){
var median
arr.sort(function(a,b){return a - b});
if(arr.length % 2 === 0){
median = (arr[(arr.length/2)-1] + arr[arr.length/2])/2;
}
else{
median = arr[(arr.length - 1)/2];
}
}
var answer = (median === mode) ? 1 : 0;
return answer
}
comparemedianandmode([1,2,3,3,3,4,5])
=> 1

Answer 1

Declaring a variable with var will limit its scope to the function in which it is being declared. You are declaring median that way inside findmedian() but then trying to access median outside of that function in the line that is assigning a value to answer.
Remove var from the lines where you are assigning median a value. At the top of comparemedianandmode() (your outermost function), declare median:
var median;
You have a function within a function, and that inner function is where you are declaring median but then you are trying to use it outside that inner function in this line:
var answer = (median === mode) ? 1 : 0;
Incidentally, you will have to do the same for mode.
Here's what it will look like after all that:
function comparemedianandmode(arr){
var median;
var mode;
function findmode(arr){
mapping = {};
mode = 0;
for(var i = 0; i < arr.length; i++){
if(!mapping[arr[i]]){
mapping[arr[i]] = 0;
}
mapping[arr[i]] += 1;
}
for(prop in mapping){
if(mapping[prop] > mode){
mode = parseInt(prop);
}
}
}
function findmedian(arr){
arr.sort(function(a,b){return a - b});
if(arr.length % 2 === 0){
median = (arr[(arr.length/2)-1] + arr[arr.length/2])/2;
} else {
median = arr[(arr.length - 1)/2];
}
}
answer = (median === mode) ? 1 : 0;
return answer;
}
console.log(comparemedianandmode([1,2,3,3,3,4,5]));