在 JavaScript 中分组以相似数字开头的字符串
假设我们有一个数组,其中包含的数字由字符串表示,如下所示:
const arr = ["1.1","1.2","1.3","2.1","2.2","3.1","3.2","3.3","4.1","4.2"];
我们需要编写一个 JavaScript 函数,该函数接受一个这样的数组,并将所有以相同数字开头的字符串分组到一个公共子数组中。
因此,我们函数的输出应如下所示:
const output = [["1.1","1.2","1.3"],["2.1","2.2"],["3.1","3.2","3.3"],["4.1","4.2"]];
示例
代码如下:
const arr = ["1.1","1.2","1.3","2.1","2.2","3.1","3.2","3.3","4.1","4.2"]; const groupSimilarStarters = arr => { let res = []; res = arr.reduce((acc, val, ind) => { const firstChar = el => { return (el || '').split('.')[0]; } if(firstChar(val) === firstChar(arr[ind - 1])){ acc[acc.length - 1].push(val); }else{ acc.push([val]); }; return acc; }, []); return res; } console.log(groupSimilarStarters(arr));
输出
控制台中的输出:
[ [ '1.1', '1.2', '1.3' ], [ '2.1', '2.2' ], [ '3.1', '3.2', '3.3' ], [ '4.1', '4.2' ] ]
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