* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
1.3 KiB
1.3 KiB
id, title, challengeType, videoUrl, forumTopicId, dashedName
id | title | challengeType | videoUrl | forumTopicId | dashedName |
---|---|---|---|---|---|
567af2437cbaa8c51670a16c | 测试对象的属性 | 1 | https://scrimba.com/c/cm8Q7Ua | 18324 | testing-objects-for-properties |
--description--
有时检查一个对象属性是否存在是非常有用的,我们可以用.hasOwnProperty(propname)
方法来检查对象是否有该属性。如果有返回true
,反之返回false
。
示例
var myObj = {
top: "hat",
bottom: "pants"
};
myObj.hasOwnProperty("top"); // true
myObj.hasOwnProperty("middle"); // false
--instructions--
修改函数checkObj
检查myObj
是否有checkProp
属性,如果属性存在,返回属性对应的值,如果不存在,返回"Not Found"
。
--hints--
checkObj("gift")
应该返回"pony"
。
assert(checkObj('gift') === 'pony');
checkObj("pet")
应该返回"kitten"
。
assert(checkObj('pet') === 'kitten');
checkObj("house")
应该返回"Not Found"
。
assert(checkObj('house') === 'Not Found');
--seed--
--seed-contents--
function checkObj(obj, checkProp) {
// Only change code below this line
return "Change Me!";
// Only change code above this line
}
--solutions--
function checkObj(obj, checkProp) {
if(obj.hasOwnProperty(checkProp)) {
return obj[checkProp];
} else {
return "Not Found";
}
}