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写一个csvColumns函数,传入一个类似CSV(如下所示格式)的数组,和索引,数组代表该CSV的列和行,并返回该索引所对应数组中指定的列。
//在CSV格式示例如下:“1,2,3\ n4,5,6\ n7,8,9\ n10,11,12” //应该被被转换成: [1,2,3] [4,5,6] [7,8,9] [10,11,12] //返回对应下标的所有数字 csvColumns( "1,2,3\n4,5,6" , [0, 1] ) => returns "1,2\n4,5" csvColumns( "1,2\n3,4\n5,6" , [5, 6, 7] ) => returns "" csvColumns( "a,b,c,d,e\n1,2,3,4,5\nf,g,h,i,j" , [1, 3, 5, 7] ) => returns "b,d\n2,4\ng,i" // param1 String // param2 Array // return String function csvColumns(csv, indices){ //TODO }
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function csvColumns(csv, indices){ var results = []; // 得到csv转换的数组 var csvArr = csv.split('\n').map(function (v,k) {return v.split(',') }); // 循环push每个 符合indices索引 的值到results csvArr.forEach(function (v, k) { var _temp = []; indices.forEach(function (v1) { v[v1] && _temp.push(v[v1]); }); _temp.length && results.push(_temp); }); return results.join('\\n'); } // 测试用例 console.log(csvColumns( "1,2,3\n4,5,6" , [0, 1] )) // returns "1,2\n4,5" console.log(csvColumns( "1,2\n3,4\n5,6" , [5, 6, 7] )) // returns "" console.log(csvColumns( "a,b,c,d,e\n1,2,3,4,5\nf,g,h,i,j" , [1, 3, 5, 7] )) // returns "b,d\n2,4\ng,i"
有没有更好的方式呢?
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function csvColumns(csv, indices){ var result = "", rawArr = csv.split("\n"), l = rawArr.length-1; rawArr.forEach(function(item,index){ var temp, s=""; indices.forEach(function(i){ temp = item.substr(2*i,1); if(temp){ result+= s+temp;s=","} }) result+= (index==l?"":"\\n"); }) return result==="\\n\\n"?"":result; }
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写一个csvColumns函数,传入一个类似CSV(如下所示格式)的数组,和索引,数组代表该CSV的列和行,并返回该索引所对应数组中指定的列。
The text was updated successfully, but these errors were encountered: