Node.js passing variable to parent function - node.js

Question

So i ran into a problem. I don't know how to pass single string to the parental function from a child function and then pass that string as a response to the client side.
This whole thing gets five recent matches from API and then checks for a win or a loss depending on the player name.
Question 1: as i said before i don't know how to pass string from a child function to the parental function and then send it as a response to client side.
Question 2: the output of this should be WWWLW and how i think it should be ordered like that. But every time it outputs in different order like LWWWW WLWWW and so on... it has good arguments but different order and i am missing something here.
code:
var request = require('request');
app.get('/history',getmatches, getwins);
function getmatches(req, res, next){
var match = {};
request({
url: "https://eun1.api.riotgames.com/lol/match/v3/matchlists/by-account/"+ID+"/recent?api_key=" + key,
json: true
}, function (error, res) {
if (!error && res.statusCode === 200) {
for(var i=0; i < 5; i++){ //getting ID's of five last matches
match[i] = res.body.matches[i].gameId;
}
req.somevariable = match;
next();
}
}
);
};
function getwins(req, res, callback){
var match = req.somevariable;
var streak = '';
var pending = 0;
for( i = 0; i < 5; i++){ // passing ID's to another api link to get single match data
request({
url: "https://eun1.api.riotgames.com/lol/match/v3/matches/"+match[i]+"?api_key=" + key,
json: true
}, function(req,res, body){
for(var j = 0; j < 10; j++){ //looping through 10 players in a match to find specific one
if(body.participantIdentities[j].player.summonerName == nickname){
if( body.participants[j].stats.win == true){
streak += 'W';
}else{
streak += 'L';
}
}
}
if(pending == 4){
console.log(streak); // need this to pass to parent function
return callback(null, streak); // is this something i need ?
}
pending++
});
}
// res streak string to client.js
};

Answer 1

There is solution to process all results when it done. The result variable have all results use any appropriate key instead of url;
function getwins(req, res, callback){
var match = req.somevariable;
var streak = '';
var pending = 0;
var results = {};
var total = 5;
for( i = 0; i < total; i++){ // passing ID's to another api link to get single match data
var url = "https://eun1.api.riotgames.com/lol/match/v3/matches/"+match[i]+"?api_key=" + key;
request({
url: url,
json: true
}, function(req,res, body){
for(var j = 0; j < 10; j++){ //looping through 10 players in a match to find specific one
if(body.participantIdentities[j].player.summonerName == nickname){
if( body.participants[j].stats.win == true){
streak += 'W';
}else{
streak += 'L';
}
}
}
console.log(streak); // need this to pass to parent function
results[url] = streak;
if( total == Object.keys(results).length ) {
// here all requests are done - do with all result what you need
console.log( results );
}
return callback(null, streak); // is this something i need ?
}
});
}
// res streak string to client.js
};