2.1 KiB
2.1 KiB
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
ac6993d51946422351508a41 | 截断字符串 | 5 | 16089 | truncate-a-string |
--description--
如果传入的字符串(第一个参数)的长度大于传入的值(第二个参数),请在这个位置截断它, 并在后面加上 ...
,然后返回结果。
--hints--
truncateString("A-tisket a-tasket A green and yellow basket", 8)
应返回 A-tisket...
。
assert(
truncateString('A-tisket a-tasket A green and yellow basket', 8) ===
'A-tisket...'
);
truncateString("Peter Piper picked a peck of pickled peppers", 11)
应返回 Peter Piper...
。
assert(
truncateString('Peter Piper picked a peck of pickled peppers', 11) ===
'Peter Piper...'
);
truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)
应返回 A-tisket a-tasket A green and yellow basket
。
assert(
truncateString(
'A-tisket a-tasket A green and yellow basket',
'A-tisket a-tasket A green and yellow basket'.length
) === 'A-tisket a-tasket A green and yellow basket'
);
truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)
应返回 A-tisket a-tasket A green and yellow basket
。
assert(
truncateString(
'A-tisket a-tasket A green and yellow basket',
'A-tisket a-tasket A green and yellow basket'.length + 2
) === 'A-tisket a-tasket A green and yellow basket'
);
truncateString("A-", 1)
应返回字符串 A...
。
assert(truncateString('A-', 1) === 'A...');
truncateString("Absolutely Longer", 2)
应返回 Ab...
。
assert(truncateString('Absolutely Longer', 2) === 'Ab...');
--seed--
--seed-contents--
function truncateString(str, num) {
return str;
}
truncateString("A-tisket a-tasket A green and yellow basket", 8);
--solutions--
function truncateString(str, num) {
if (num >= str.length) {
return str;
}
return str.slice(0, num) + '...';
}
truncateString("A-tisket a-tasket A green and yellow basket", 8);