Make a function that looks through an array of objects (first argument) and returns an array of all objects that have matching property and value pairs (second argument). Each property and value pair of the source object has to be present in the object from the collection if it is to be included in the returned array. From FreeCodeCamp

wherefore-art-thou.js

function whatIsInAName(collection, source) {
  // What's in a name?
  var arr = [];
  // Only change code below this line
  var sKeyVal = [];
  sKeyVal.push( Object.keys(source) ); //find the keys in the source
  sKeyVal.push( Object.values(source) ); //find the values in source
  var match = 0;
  
  for(var i = 0; i < collection.length; i++){
    cKeyVal = [];
    cKeyVal.push( Object.keys(collection[i]) ); // find the keys in the first collection obj
    cKeyVal.push( Object.values(collection[i]) ); //find the values in the first collection obj
    
    if(sKeyVal[0].length > 1){
        
      for(j = 0; j < sKeyVal[0].length; j++){ //test the coll keys against the source keys
        index = cKeyVal[0].indexOf(sKeyVal[0][j]);
        
        if(index != -1){
          if(cKeyVal[1][index] == sKeyVal[1][j]){
            match++;
            
            if(match == sKeyVal[0].length){
              arr.push(collection[i]);
              match = 0;
            }
          } //end if cKeyVal
        } //end if index
      } //end for j  
      match = 0;
    } //endif
    
    else{
      for(j = 0; j < sKeyVal[0].length; j++){ //test the coll keys against the source keys
        index = cKeyVal[0].indexOf(sKeyVal[0][j]);
        if(index != -1){
          if(cKeyVal[1][index] == sKeyVal[1][j]){
            arr.push(collection[i]);
          } //end if cKeyVal
        } //end if index
      } //end for j
    }//end else
    
  } //end for i
  
  // Only change code above this line
  return arr;
}

whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });