* 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>
1.8 KiB
1.8 KiB
id, title, challengeType, videoUrl, forumTopicId, dashedName
id | title | challengeType | videoUrl | forumTopicId | dashedName |
---|---|---|---|---|---|
599a789b454f2bbd91a3ff4d | 比较不同值 | 1 | https://scrimba.com/c/cm8PqCa | 301174 | practice-comparing-different-values |
--description--
在上两个挑战中,我们学习了相等运算符 (==
) 和严格相等运算符 (===
)。现在让我们快速回顾并实践一下。
如果要比较的值不是同一类型,相等运算符会先执行数据类型转换,然后比较值。而严格相等运算符只比较值,不会进行数据类型转换。
由此可见,相等运算符和严格相等运算符的区别是:前者会执行隐式类型转换,后者不会。
示例
3 == '3' // returns true because JavaScript performs type conversion from string to number
3 === '3' // returns false because the types are different and type conversion is not performed
提示
在JavaScript中,你可以使用typeof
运算符确定变量的类型或值,如下所示:
typeof 3 // returns 'number'
typeof '3' // returns 'string'
--instructions--
编辑器中的compareEquality
函数使用相等运算符比较两个值。修改函数,使其仅在值严格相等时返回 "Equal" 。
--hints--
compareEquality(10, "10")
应该返回 "Not Equal"。
assert(compareEquality(10, '10') === 'Not Equal');
compareEquality("20", 20)
应该返回 "Not Equal"。
assert(compareEquality('20', 20) === 'Not Equal');
你应该使用===
运算符。
assert(code.match(/===/g));
--seed--
--seed-contents--
// Setup
function compareEquality(a, b) {
if (a == b) { // Change this line
return "Equal";
}
return "Not Equal";
}
compareEquality(10, "10");
--solutions--
function compareEquality(a,b) {
if (a === b) {
return "Equal";
}
return "Not Equal";
}