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fix(curriculum): clarify Check if an Object has a Property (#42156)

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* fix: clarify Check if an Object has a Property

* fix: give extra clarity on object checking
This commit is contained in:
Sem Bauke
2021-05-18 18:36:53 +02:00
committed by GitHub
parent 18ccc3bd34
commit f3e8a0f0c2
1 changed files with 18 additions and 10 deletions
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26
curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.md
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@ -19,10 +19,18 @@ Both of these would return `true`.
# --instructions-- # --instructions--
We've created an object, `users`, with some users in it and a function `isEveryoneHere`, which we pass the `users` object to as an argument. Finish writing this function so that it returns `true` only if the `users` object contains all four names, `Alan`, `Jeff`, `Sarah`, and `Ryan`, as keys, and `false` otherwise. Finish writing the function so that it returns true if the object passed to it contains all four names, `Alan`, `Jeff`, `Sarah` and `Ryan` and returns false otherwise.
# --hints-- # --hints--
The `users` object should not be accessed directly
```js
assert(code.match(/users/gm).length <= 2)
```
The `users` object should only contain the keys `Alan`, `Jeff`, `Sarah`, and `Ryan` The `users` object should only contain the keys `Alan`, `Jeff`, `Sarah`, and `Ryan`
```js ```js
@ -35,13 +43,13 @@ assert(
); );
``` ```
The function `isEveryoneHere` should return `true` if `Alan`, `Jeff`, `Sarah`, and `Ryan` are properties on the `users` object The function `isEveryoneHere` should return `true` if `Alan`, `Jeff`, `Sarah`, and `Ryan` are properties on the object passed to it.
```js ```js
assert(isEveryoneHere(users) === true); assert(isEveryoneHere(users) === true);
``` ```
The function `isEveryoneHere` should return `false` if `Alan` is not a property on the `users` object The function `isEveryoneHere` should return `false` if `Alan` is not a property on the object passed to it.
```js ```js
assert( assert(
@ -52,7 +60,7 @@ assert(
); );
``` ```
The function `isEveryoneHere` should return `false` if `Jeff` is not a property on the `users` object The function `isEveryoneHere` should return `false` if `Jeff` is not a property on the object passed to it.
```js ```js
assert( assert(
@ -63,7 +71,7 @@ assert(
); );
``` ```
The function `isEveryoneHere` should return `false` if `Sarah` is not a property on the `users` object The function `isEveryoneHere` should return `false` if `Sarah` is not a property on the object passed to it.
```js ```js
assert( assert(
@ -74,7 +82,7 @@ assert(
); );
``` ```
The function `isEveryoneHere` should return `false` if `Ryan` is not a property on the `users` object The function `isEveryoneHere` should return `false` if `Ryan` is not a property on the object passed to it.
```js ```js
assert( assert(
@ -109,7 +117,7 @@ let users = {
} }
}; };
function isEveryoneHere(obj) { function isEveryoneHere(userObj) {
// Only change code below this line // Only change code below this line
// Only change code above this line // Only change code above this line
@ -140,13 +148,13 @@ let users = {
} }
}; };
function isEveryoneHere(obj) { function isEveryoneHere(userObj) {
return [ return [
'Alan', 'Alan',
'Jeff', 'Jeff',
'Sarah', 'Sarah',
'Ryan' 'Ryan'
].every(i => obj.hasOwnProperty(i)); ].every(user => userObj.hasOwnProperty(user));
} }
console.log(isEveryoneHere(users)); console.log(isEveryoneHere(users));