diff --git a/index.js b/index.js
index 10f4784..d7bf5d5 100644
--- a/index.js
+++ b/index.js
@@ -48,48 +48,233 @@ const player = {
     { id: 5, name: 'Israeli', songs: [4, 5] },
   ],
   playSong(song) {
-    console.log(/* your code here */)
+    console.log(
+      "Playing " + song.title 
+      +" from " + song.album 
+      + " by " + song.artist 
+      + " | " 
+      + durationFormat(song.duration) 
+      +".")
   },
 }
 
 function playSong(id) {
-  // your code here
-}
 
-function removeSong(id) {
-  // your code here
+  if (!(checkId(player.songs,id))) throw "ERROR: id doesn't exict.";
+  else for(let i = 0 ; i < player.songs.length ; i ++){
+    if (player.songs[i].id === id)
+      return player.playSong(player.songs[i]);
+  } 
 }
 
-function addSong(title, album, artist, duration, id) {
-  // your code here
+function durationFormat(duration){
+  let minutes = Math.floor(duration / 60);
+  let seconds = duration % 60;
+  if(minutes < 10 && seconds < 10)
+    return "0"+minutes+":"+"0"+seconds;
+
+    else if (minutes < 10) return "0"+minutes+":"+seconds;
+         else if (seconds < 10) return minutes+":0"+seconds;
+              else return minutes+":"+seconds;
 }
 
-function removePlaylist(id) {
-  // your code here
+function checkId(songs,id){
+  for (let i = 0 ; i < songs.length ; i ++){
+    if (id === songs[i].id)
+      return true;
+  }
+  return false;
 }
 
-function createPlaylist(name, id) {
-  // your code here
+function playlistDuration(id) {
+
+  let correctPlaylist = findPlaylistById(id) //correctPlaylist contain the wanted playlist
+  let save = 0,
+    sum = 0
+  for (let i = 0; i < correctPlaylist.songs.length; i++) {
+    save = correctPlaylist.songs[i]
+    for (let j = 0; j < player.songs.length; j++) {
+      if (player.songs[j].id === save) sum += player.songs[j].duration
+    }
+  }
+  return sum
 }
 
-function playPlaylist(id) {
-  // your code here
+function findPlaylistById(id) {
+  let correctPlaylist
+  for (let i = 0; i < player.playlists.length; i++) {
+    if (id === player.playlists[i].id) correctPlaylist = player.playlists[i]
+  }
+  return correctPlaylist
 }
 
 function editPlaylist(playlistId, songId) {
-  // your code here
+  if (!checkId(player.playlists, playlistId)){
+    throw "ID of the playlist doesn't exist."
+  }
+  if (!checkId(player.songs, songId)){
+      throw "ID of the song doesn't exist."
+  }
+  for (let i = 0; i < player.playlists.length; i++) {
+    if (playlistId === player.playlists[i].id){
+      for (let x = 0; x < player.playlists[i].songs.length; x++) {
+        if (songId === player.playlists[i].songs[x]){
+            player.playlists[i].songs.splice(x,1);
+            }
+          else 
+                  player.playlists[i].songs.push(songId);
+            }
+          if (player.playlists[i].songs.length === 0)
+             removePlaylist(player.playlists[i].id);
+        }
+      }
 }
 
-function playlistDuration(id) {
-  // your code here
+function newId(arr){
+  let max = arr[0];
+  for (let i = 0; i < arr.length; i++) {
+    if (max < arr[i].id)
+    max = arr[i].id;   
+  }
+    return max+1;
+}
+
+function oppDuration(duration){
+  duration = duration.split(':')
+  let minutes = parseInt(duration[0]) * 60
+  let seconds = parseInt(duration[1])
+  return minutes + seconds
+}
+
+function addSong(title, album, artist, duration,  id = newId(player.songs)) {
+  if (checkId(player.songs, id)){
+    throw "ID exists"
+  }
+  duration= oppDuration(duration);
+  let newSong = {id: id, title: title, album: album, artist: artist, duration: duration};
+  player.songs.push(newSong)
+  return id;
+}
+
+function removeSong(id) {
+  if (!checkId(player.songs, id)){
+    throw "ID doesn't exist.";
+  }
+  for (let i = 0; i<player.songs.length; i++){
+    if (player.songs[i].id === id){
+      player.songs.splice(i,1)
+    }
+  }
+  for (let j = 0; j<player.playlists.length; j++){
+    for(let x = 0; x<player.playlists[j].songs.length; x++){
+      if (player.playlists[j].songs[x] === id){
+        player.playlists[j].songs.splice(x, 1);
+      }
+    }
+  }
+}
+
+function removePlaylist(id) {
+  if (!checkId(player.playlists, id)){
+    throw "ID doesn't exist.";
+  }
+  for (let i = 0; i<player.playlists.length; i++){
+    if (player.playlists[i].id === id){
+      player.playlists.splice(i, 1);
+    }
+  }
+}
+
+function createPlaylist(name, id = newId(player.playlists)) {
+  if (checkId(player.playlists, id)){
+    throw "ID is taken"
+  }
+  let newPlaylist = { id: id, name: name, songs: []}
+  player.playlists.push(newPlaylist)
+  return id;
+}
+
+function playPlaylist(id) {
+  if (!checkId(player.playlists, id)){
+    throw "ID dont exist"
+  }
+  for (let i = 0; i < player.playlists.length; i++) {
+    if(id === player.playlists[i].id){
+      for (let x = 0; x < player.playlists[i].songs.length; x++) {
+          playSong(player.playlists[i].songs[x]);
+      }
+    }
+  }
+  return id;
 }
 
 function searchByQuery(query) {
-  // your code here
+  let tempQuery = query.toUpperCase()
+  const results = { songs: [], playlists: [] }
+  for (let i = 0; i < player.playlists.length; i++) {
+    //for playlists
+    if (player.playlists[i].name.toUpperCase().includes(tempQuery)) {
+      results.playlists.push(player.playlists[i])
+      results.playlists.sort((a, b) => {
+        if (a.name.toUpperCase() < b.name.toUpperCase()) return -1
+      })
+    }
+  }
+  for (let i = 0; i < player.songs.length; i++) {
+    if (
+      player.songs[i].album.toUpperCase().includes(tempQuery) ||
+      player.songs[i].artist.toUpperCase().includes(tempQuery) ||
+      player.songs[i].title.toUpperCase().includes(tempQuery)
+    ) {
+      results.songs.push(player.songs[i])
+      results.songs.sort((a, b) => {
+        if (a.title.toUpperCase() < b.title.toUpperCase()) return -1
+      })
+    }
+  }
+  return results
 }
 
 function searchByDuration(duration) {
-  // your code here
+  duration = oppDuration(duration) 
+  let arrSongs = arrLengthSongs(duration) 
+  let arrPlaylist = arrLengthPlaylist(duration)
+  return arrSongs[0] < arrPlaylist[0] ? arrSongs[1] : arrPlaylist[1]
+}
+
+function arrLengthSongs(duration) {
+  let arr = []
+  let minDuration = duration,
+    index = 0
+  for (let i = 0; i < player.songs.length; i++) {
+    if (minDuration > Math.abs(duration - player.songs[i].duration)) {
+      minDuration = Math.abs(duration - player.songs[i].duration)
+      index = i
+    }
+  }
+  arr.push(minDuration)
+  arr.push(player.songs[index])
+  return arr
+}
+
+function arrLengthPlaylist(duration) {
+  let arr = []
+  let minDuration = duration,
+    index = 0
+  for (let i = 0; i < player.playlists.length; i++) {
+    if (
+      minDuration >
+      Math.abs(duration - playlistDuration(player.playlists[i].id))
+    ) {
+      minDuration = Math.abs(
+        duration - playlistDuration(player.playlists[i].id)
+      )
+      index = i
+    }
+  }
+  arr.push(minDuration)
+  arr.push(player.playlists[index])
+  return arr
 }
 
 module.exports = {
@@ -104,4 +289,4 @@ module.exports = {
   playlistDuration,
   searchByQuery,
   searchByDuration,
-}
+}