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JavaScript

Posted by anonymous123
anonymous123
5,794 Points

bracket notation works but dot notation doesnt work

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(checkProp) {
  // Your Code Here
 if(myObj.hasOwnProperty(checkProp)) {
   return myObj[checkProp]                   <----------------Right here dot notation doesnt work 
                                                                                        why is that?
 } else {
   return "Not Found"
 }

}

// Test your code by modifying these values
checkObj("gift");
Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,741 Points
Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,741 Points

Your question/answers/comments have been updated with code formatting. Check out the Markdown Cheatsheet below the Add an Answer submission for syntax examples.

2 Answers

Steven Parker
Steven Parker
243,201 Points
Steven Parker
Steven Parker
243,201 Points

Since the function is passed a property name as a string argument, there's really no opportunity to use dot notation.

Dot notation is what you use to access a property using the literal property name that you know in advance (like "MyObj.bed"). But to access a property using a name from a variable, bracket notation is the only option.

anonymous123
anonymous123
5,794 Points

Steven Parker lets say that when i called the function i input text not a string in the place of value will it be converted to a string because of typecasting?

  let updateRecords = (id, prop, value) => {
  if(prop !== "tracks" && value !== "") {
    collection[id][prop] = value ; 
  }

  if(prop === "tracks") {
    collection[id][prop] = [ ]
    collection[id][prop].push(value) ;
  }

  if(prop === "tracks" && value !== "") {
    collection[id][prop].push(value) ;   
  } 

  if(value === "") {
    delete collection[id][prop] ; 
  }
}
Steven Parker
Steven Parker
243,201 Points
Steven Parker
Steven Parker
243,201 Points

I'm not sure what you mean by "text". When is "text not a string"?

I see your examples have several words in quotes, but those are string literals. Not variables, but still strings.

anonymous123
anonymous123
5,794 Points
anonymous123
anonymous123
5,794 Points

Steven Parker by text i mean just a word.

collection[id][prop].push(value) ; <- look at this if i entered hello in the spot of value when i called the function would the word be converted into a string? you cant push a word into an array

anonymous123
anonymous123
5,794 Points

Steven Parker i dont have a computer with me right now i cant check

Steven Parker
Steven Parker
243,201 Points
Steven Parker
Steven Parker
243,201 Points

I'm still not sure what you mean by a "word". If it's not in quotes, it must be a variable's name, which stands for whatever the variable was assigned with. If it is in quotes, then it is a string literal.

Either way, you can push it into an array. What would make you think you can't?