ee1e8abd87
* 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>
119 lines
2.2 KiB
Markdown
119 lines
2.2 KiB
Markdown
---
|
||
id: 56533eb9ac21ba0edf2244c6
|
||
title: 排队
|
||
challengeType: 1
|
||
videoUrl: 'https://scrimba.com/c/ca8Q8tP'
|
||
forumTopicId: 18307
|
||
dashedName: stand-in-line
|
||
---
|
||
|
||
# --description--
|
||
|
||
在计算机科学中<dfn>队列</dfn>（queue）是一个抽象的数据结构，队列中的条目都是有秩序的。新的条目会被加到`队列`的末尾，旧的条目会从`队列`的头部被移出。
|
||
|
||
写一个函数`nextInLine`，用一个数组(`arr`)和一个数字(`item`)作为参数。
|
||
|
||
把数字添加到数组的结尾，然后移出数组的第一个元素。
|
||
|
||
最后`nextInLine`函数应该返回被删除的元素。
|
||
|
||
# --hints--
|
||
|
||
`nextInLine([], 5)`应该返回一个数字。
|
||
|
||
```js
|
||
assert.isNumber(nextInLine([], 5));
|
||
```
|
||
|
||
`nextInLine([], 1)`应该返回`1`。
|
||
|
||
```js
|
||
assert(nextInLine([], 1) === 1);
|
||
```
|
||
|
||
`nextInLine([2], 1)`应该返回`2`。
|
||
|
||
```js
|
||
assert(nextInLine([2], 1) === 2);
|
||
```
|
||
|
||
`nextInLine([5,6,7,8,9], 1)`应该返回`5`。
|
||
|
||
```js
|
||
assert(nextInLine([5, 6, 7, 8, 9], 1) === 5);
|
||
```
|
||
|
||
在`nextInLine(testArr, 10)`执行后`testArr[4]`应该是`10`。
|
||
|
||
```js
|
||
nextInLine(testArr, 10);
|
||
assert(testArr[4] === 10);
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --before-user-code--
|
||
|
||
```js
|
||
var logOutput = [];
|
||
var originalConsole = console
|
||
function capture() {
|
||
var nativeLog = console.log;
|
||
console.log = function (message) {
|
||
logOutput.push(message);
|
||
if(nativeLog.apply) {
|
||
nativeLog.apply(originalConsole, arguments);
|
||
} else {
|
||
var nativeMsg = Array.prototype.slice.apply(arguments).join(' ');
|
||
nativeLog(nativeMsg);
|
||
}
|
||
};
|
||
}
|
||
|
||
function uncapture() {
|
||
console.log = originalConsole.log;
|
||
}
|
||
|
||
capture();
|
||
```
|
||
|
||
## --after-user-code--
|
||
|
||
```js
|
||
uncapture();
|
||
testArr = [1,2,3,4,5];
|
||
(function() { return logOutput.join("\n");})();
|
||
```
|
||
|
||
## --seed-contents--
|
||
|
||
```js
|
||
function nextInLine(arr, item) {
|
||
// Only change code below this line
|
||
|
||
return item;
|
||
// Only change code above this line
|
||
|
||
|
||
}
|
||
|
||
// Setup
|
||
var testArr = [1,2,3,4,5];
|
||
|
||
// Display code
|
||
console.log("Before: " + JSON.stringify(testArr));
|
||
console.log(nextInLine(testArr, 6));
|
||
console.log("After: " + JSON.stringify(testArr));
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```js
|
||
var testArr = [ 1,2,3,4,5];
|
||
|
||
function nextInLine(arr, item) {
|
||
arr.push(item);
|
||
return arr.shift();
|
||
}
|
||
```
|