How to do array deduplication

Question: Write an array deduplication function. (use as many methods as possible)

//Such as input array [1,"a",{b:2},{c:3},{b:2},{b:"2"},"1","a"], return [1 ,"a",{b:2},{c:3},"1"]

 

function unique(arr) {
     var temp=[];     // store new array 
    var keys = [];   // store object key set 
  for ( var i=0; i<arr.length; i++ ) {
       var a = arr[ i];
     if ( typeof a !== "object" ) {
         var idx = temp. indexOf(a)
         if (idx>-1 ){
             continue ;
        }else {
            temp.push(a);
        }
    } else {
         for ( var k in a) {
             var idx1 = keys.indexOf(k); 
             if (idx1===-1) {   // if the object doesn't exist in keys yet 
                keys.push(k);   // store key 
                temp.push(a);   // value store new array 
            }
        }
    }
    
  }
  return temp;
}