七、DNA Pairing 生成DNA配对
代码如下:
1 | function pairElement(str) { |
2 | var arr = str.split(''), |
3 | rArr = []; |
4 | for(var i=0;i<arr.length;i++){ |
5 | switch(arr[i]){ |
6 | case 'A': |
7 | rArr.push(["A","T"]); |
8 | break; |
9 | case 'T': |
10 | rArr.push(["T","A"]); |
11 | break; |
12 | case 'C': |
13 | rArr.push(["C","G"]); |
14 | break; |
15 | case 'G': |
16 | rArr.push(["G","C"]); |
17 | break; |
18 | } |
19 | } |
20 | return rArr; |
21 | } |
22 |
23 | pairElement("GCG"); |
八、Missing letters 求出缺小的字母
代码如下:
1 | function fearNotLetter(str) { |
2 | var s = str.charCodeAt(0), |
3 | len = str.length, |
4 | e = str.charCodeAt(len - 1), |
5 | matchStr = '', |
6 | r = ''; |
7 | if(e - s + 1 == len){ |
8 | return undefined; |
9 | }else{ |
10 | for(var i = s;i <= e;i++){ |
11 | matchStr += String.fromCharCode(i); |
12 | } |
13 | for(var j = 0;j < matchStr.length; j++){ |
14 | var t = matchStr.charAt(j); |
15 | if(str.indexOf(t)<0){ |
16 | r += t; |
17 | } |
18 | } |
19 | return r; |
20 | } |
21 | } |
22 |
23 | fearNotLetter("abce"); |
九、Boo who 判断值是否为boolean值
代码如下:
1 | function booWho(bool) { |
2 | // What is the new fad diet for ghost developers? The Boolean. |
3 | return typeof bool === 'boolean'; |
4 | } |
5 |
6 | booWho(null); |
十、Sorted Union 求多数组元素去重
代码如下:
1 | function uniteUnique() { |
2 | var arr = [], |
3 | rArr = []; |
4 | for(var n=0;n<arguments.length;n++){ |
5 | arr.push(arguments[n]); |
6 | } |
7 | rArr = arr.reduce(function(a,b){ |
8 | var t = []; |
9 | for(var i=0;i<b.length;i++){ |
10 | if(a.indexOf(b[i])<0){ |
11 | t.push(b[i]); |
12 | } |
13 | } |
14 | return a.concat(t); |
15 | },[]); |
16 | return rArr; |
17 | } |
18 |
19 | uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]); |
十一、Convert HTML Entities 特殊字符转义
代码如下:
1 | function convertHTML(str) { |
2 | // :) |
3 | return str.replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"').replace(/'/g,'''); |
4 | } |
5 |
6 | convertHTML("Dolce & Gabbana"); |
十二、Spinal Tap Case 句子转化成为标准URL格式
代码如下:
1 | function spinalCase(str) { |
2 | // "It's such a fine line between stupid, and clever." |
3 | // --David St. Hubbins |
4 | var arr = str.match(/[a-zA-Z][a-z]*/g); |
5 | return arr.join('-').toLowerCase(); |
6 | } |
7 |
8 | spinalCase('This Is Spinal Tap'); |
