freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/testing-objects-for-properties.english.md

id, title, challengeType

id	title	challengeType
567af2437cbaa8c51670a16c	Testing Objects for Properties	1

Description

Sometimes it is useful to check if the property of a given object exists or not. We can use the .hasOwnProperty(propname) method of objects to determine if that object has the given property name. .hasOwnProperty() returns true or false if the property is found or not. Example

var myObj = {
  top: "hat",
  bottom: "pants"
};
myObj.hasOwnProperty("top"); // true
myObj.hasOwnProperty("middle"); // false

Instructions

Modify the function checkObj to test myObj for checkProp. If the property is found, return that property's value. If not, return "Not Found".

Tests

tests:
  - text: <code>checkObj("gift")</code> should return  <code>"pony"</code>.
    testString: assert(checkObj("gift") === "pony", '<code>checkObj("gift")</code> should return  <code>"pony"</code>.');
  - text: <code>checkObj("pet")</code> should return  <code>"kitten"</code>.
    testString: assert(checkObj("pet") === "kitten", '<code>checkObj("pet")</code> should return  <code>"kitten"</code>.');
  - text: <code>checkObj("house")</code> should return  <code>"Not Found"</code>.
    testString: assert(checkObj("house") === "Not Found", '<code>checkObj("house")</code> should return  <code>"Not Found"</code>.');

Challenge Seed

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

function checkObj(checkProp) {
  // Your Code Here

  return "Change Me!";
}

// Test your code by modifying these values
checkObj("gift");

Solution

var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};
function checkObj(checkProp) {
  if(myObj.hasOwnProperty(checkProp)) {
    return myObj[checkProp];
  } else {
    return "Not Found";
  }
}