1.9 KiB
1.9 KiB
id, title, challengeType, videoUrl, localeTitle
| id | title | challengeType | videoUrl | localeTitle |
|---|---|---|---|---|
| 56bbb991ad1ed5201cd392cd | Manipulate Arrays With shift() | 1 | 使用shift（）操纵数组 |
Description
pop()总是删除数组的最后一个元素。如果你想删除第一个怎么办？这就是.shift()用武之地。它就像.pop()一样工作，除了它删除了第一个元素而不是最后一个元素。 Instructions
.shift()函数从myArray删除第一项，将“shift off”值分配给removedFromMyArray 。 Tests
tests:
- text: '<code>myArray</code>现在应该等于<code>[["dog", 3]]</code> 。'
testString: 'assert((function(d){if(d[0][0] == "dog" && d[0][1] === 3 && d[1] == undefined){return true;}else{return false;}})(myArray), "<code>myArray</code> should now equal <code>[["dog", 3]]</code>.");'
- text: '<code>removedFromMyArray</code>应该包含<code>["John", 23]</code> 。'
testString: 'assert((function(d){if(d[0] == "John" && d[1] === 23 && typeof removedFromMyArray === "object"){return true;}else{return false;}})(removedFromMyArray), "<code>removedFromMyArray</code> should contain <code>["John", 23]</code>.");'
Challenge Seed
// Example
var ourArray = ["Stimpson", "J", ["cat"]];
var removedFromOurArray = ourArray.shift();
// removedFromOurArray now equals "Stimpson" and ourArray now equals ["J", ["cat"]].
// Setup
var myArray = [["John", 23], ["dog", 3]];
// Only change code below this line.
var removedFromMyArray;
After Test
console.info('after the test');
Solution
// solution required