diff --git a/index.js b/index.js
index 10f4784..3499b6b 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,134 @@
+//assistance functions
+
+const { pipelinePrimaryTopicReference } = require("@babel/types");
+
+//converts seconds to the required minute format
+function secondsToMinutesConvertor(songDuration){
+  let durationInMinutes = songDuration / 60;
+  let minutes = 0;
+  let seconds = 0;
+  let lengthFormat = 0;
+  minutes = Math.floor(durationInMinutes);
+  if(minutes === 0){
+    minutes = "00"
+  }else{
+      if(minutes < 10){
+        minutes = "0" + minutes.toString();
+      }else{
+        minutes = minutes.toString();
+      }
+}
+  seconds = (Math.round((durationInMinutes - minutes) * 60));
+  if(seconds === 0){
+    seconds = "00"
+  }else {
+      if( seconds < 10){
+        seconds = "0" + seconds.toString();
+      }else{
+        seconds = seconds.toString();
+      }
+}
+  lengthFormat = minutes + ":" + seconds
+  return lengthFormat
+}
+ // converts string minutes format to secoonds
+ function convertToseconds(durationInMinutes){
+  let minutes = Number(durationInMinutes.split("").slice(0, 2).join(""));
+  let seconds = Number(durationInMinutes.split("").slice(3, 5).join(""));
+  let totalTime = (minutes * 60) + seconds;
+  return totalTime
+}
+//recieves a song's id an returns that song's object
+function getSongObjectById(id){
+    let song = player.songs.filter(songObject => {
+        if(songObject.id === id){
+          return songObject;
+        }
+      })
+      if(song.length == false){
+        throw "undefined id";
+      }
+      song = song[0];
+      return song;
+}
+// generat new ID function
+function generatId(id, playlistsOrSongs, songsOrPlaylistsIdCounter){
+  let newId = 0;
+  let indexCounter = 0;
+  if(!id){
+      newId = songsOrPlaylistsIdCounter;
+  }else{
+      player[playlistsOrSongs].forEach(song => {
+              if(song.id === id){
+              throw "taken ID"
+              }else{
+                  indexCounter ++;
+                  if(indexCounter === player[playlistsOrSongs].length){
+                  newId = id;
+                  }
+          }
+          });
+  }
+  songsOrPlaylistsIdCounter++;
+  return newId
+}
+// get playlist by ID
+function getPlaylistById(id){
+  let indexCounter = 0;
+  let playlistById = player.playlists.filter(playlist =>{
+      if(playlist.id === id){
+        return playlist;
+      }else{
+        indexCounter ++;
+        if(indexCounter === player.playlists.length){
+          throw "non existant ID"
+        }
+      }
+    })
+    return playlistById[0];
+  }
+  //closest song or playlist function
+function initialClosest (songsOrPlaylists , totalTime){
+  if(songsOrPlaylists === "playlists"){
+      return Math.abs(totalTime -  playlistDuration(player.playlists[0]["id"]))
+  }else{
+     return Math.abs(totalTime - player[songsOrPlaylists][0].duration)
+  }
+}
+//find closest song
+function findClosest(songsOrPlaylists, closestTime, totalTime){
+  let closest = player[songsOrPlaylists][0];
+  player[songsOrPlaylists].forEach(song =>{
+      if(songsOrPlaylists === "playlists"){
+          let songDuration = playlistDuration(song["id"]);
+          if(Math.abs(totalTime - songDuration) < closestTime){
+              closestTime = Math.abs(totalTime - songDuration);
+              closest = song;
+          }
+      }else{
+          if(Math.abs(totalTime - song.duration) < closestTime){
+              closestTime = Math.abs(totalTime - song.duration);
+              closest = song;
+          }
+      } 
+  })
+  return closest;
+}
+//check for non existent ID
+function IDchecker(id, playlistOrSong){
+  let indexCounter = 0;
+  player[playlistOrSong].forEach(object => {
+    if (object.id === id){
+      indexCounter = -1;
+    } else{
+      indexCounter ++;
+      if(indexCounter === player[playlistOrSong].length){
+        throw "non existent id"
+      }
+    }
+  })
+}
+// main work
 const player = {
   songs: [
     {
@@ -47,51 +178,181 @@ const player = {
     { id: 1, name: 'Metal', songs: [1, 7, 4] },
     { id: 5, name: 'Israeli', songs: [4, 5] },
   ],
-  playSong(song) {
-    console.log(/* your code here */)
+  playSong(id) {
+    let song = getSongObjectById(id);
+    song.duration = secondsToMinutesConvertor(song.duration);
+    return("Playing " + song.title + " from " + song.album + " by " + song.artist + " | " + song.duration + ".")
   },
 }
-
+// playSong outside function
 function playSong(id) {
-  // your code here
+ console.log(player.playSong(id))
 }
-
+playSong(5);
+//remove song function
 function removeSong(id) {
-  // your code here
+  let indexCounter = 0;
+    player.songs.forEach(song => {
+      if(song.id === id){
+        player.songs.splice(indexCounter ,1);
+      }else{
+        indexCounter ++;
+        if(indexCounter === player.songs.length){
+          throw "Undefined ID"
+        }
+      }
+    })
+    player.playlists.forEach(playlist => {
+      let playlistIndexCounter = 0;
+      let songIndexCounter = 0;
+      playlist.songs.forEach(song => {
+        if (song === id){
+           player.playlists[playlistIndexCounter].songs.splice(songIndexCounter, 1);
+        }else{
+          songIndexCounter ++;
+        }
+      })
+    })
 }
-
+//add song function
+let idCounter = 8;
 function addSong(title, album, artist, duration, id) {
-  // your code here
+  let newSongId = generatId(id, "songs", idCounter);
+  duration = convertToseconds(duration);
+  let newSong = {
+    "id" : newSongId,
+    "title" : title,
+    "album" : album,
+    "artist" : artist,
+    "duration" : duration
+  }
+  player.songs.push(newSong);
+  return newSongId
 }
-
+//remove playlist function
 function removePlaylist(id) {
-  // your code here
+  let indexCounter = 0;
+  player.playlists.forEach(playlist => {
+    if(playlist.id === id){
+      player.playlists.splice(indexCounter ,1);
+    }else{
+      indexCounter ++;
+        if(indexCounter === player.playlists.length){
+          throw "Undefined ID"
+        }
+      }
+    }) 
 }
-
+//create playlist function
+let playlistIdCounter = 6;
 function createPlaylist(name, id) {
-  // your code here
+  let playListId = generatId(id, "playlists", playlistIdCounter);
+    console.log(playListId);
+  let newPlaylist = {
+    "id" : playListId,
+    "name" : name,
+    "songs" : []
+  }
+  player.playlists.push(newPlaylist);
+  return playListId
 }
-
+// playPLaylist function
 function playPlaylist(id) {
-  // your code here
+  let PlaylsitById = player.playlists.filter(playlist =>{
+    if(playlist.id === id){
+      return playlist;
+    }
+  })
+  PlaylsitById[0].songs.forEach(song => playSong(song));
 }
 
-function editPlaylist(playlistId, songId) {
-  // your code here
+//edit playlist function
+function editPlaylist(playlistId, songId){
+  IDchecker(playlistId, "playlists");
+  IDchecker(songId, "songs");
+  let playlistIndexCounter = 0;
+  player.playlists.forEach(playlist =>{
+  let songsIndexCounter = 0;
+  if(playlist.id === playlistId){
+    playlist.songs.forEach(song => {
+      if(songId === song){
+         if(playlist.songs.length === 1){
+           player.playlists.splice(playlistIndexCounter, 1)
+         }else{
+           playlist.songs.splice(songsIndexCounter, 1);
+         }
+      }else{
+        songsIndexCounter ++;
+        if(songsIndexCounter === playlist.songs.length){
+          let indexCounter = 0;
+          player.songs.forEach(song => {
+            if(song.id === songId){
+              player.playlists[playlistIndexCounter].songs.push(songId);
+            }else{
+              indexCounter ++;
+            }
+          })
+        }
+      }
+    })
+  }else{
+    playlistIndexCounter ++;
+  }
+})
 }
-
+// playlistDuration function
 function playlistDuration(id) {
-  // your code here
+   let requestedPlaylist = getPlaylistById(id);
+   let songsLengthsArray = requestedPlaylist.songs.map(song => {
+     return (getSongObjectById(song).duration);
+   })
+   let totalDuration = (songsLengthsArray.reduce((acc, value) => {
+    acc += value;
+    return acc;
+  }))
+  return totalDuration;
 }
-
+//search by query function
 function searchByQuery(query) {
-  // your code here
+  let matchingSongs = player.songs.filter(song => {
+    for(let property in song){
+      if (song[property].toString().toLowerCase().includes(query.toLowerCase())){
+        return song;
+      }
+    }
+  })
+  let matchingPlaylists = player.playlists.filter(playlist => {
+    if(playlist.name.toLowerCase().includes(query.toLowerCase())){
+      return playlist;
+    }
+  })
+  matchingSongs = matchingSongs.sort((a, b) => {
+    if(b["title"] < a["title"]){
+        return 1;
+    }
+    if(b["title"] > a["title"]){
+        return -1
+    }
+    return 0;
+  });
+  return {
+    "songs" : matchingSongs,
+    "playlists" : matchingPlaylists
+  }
 }
-
+// search by duratiopn function
 function searchByDuration(duration) {
-  // your code here
+  let totalTime = convertToseconds(duration);
+  let closestSongtTime = initialClosest("songs", totalTime);
+  let closestPlaylistTime = initialClosest("playlists", totalTime);
+  let closestSong = findClosest("songs", closestSongtTime, totalTime);
+  let closestPlaylist = findClosest("playlists", closestPlaylistTime, totalTime);
+   if(closestSongtTime > closestPlaylistTime){
+       return closestPlaylist;
+   }else{
+    return closestSong;
+   }
 }
-
 module.exports = {
   player,
   playSong,