javascript - 如果数字:true is set in localeCompare function会有什么变化吗

Question

我有包含数字和字符串类型的表值，并且想知道设置 numeric true 是否会带来对列中字符串值进行排序的任何更改

Answer 1

是的，将数据视为数字确实可以改变顺序。考虑一下:

const column = [ "1", "3", "10", "24", "212" ];

column.sort((a, b) => a.localeCompare(b));
console.log("lexicographical sort:", column);

column.sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
console.log("sort with numeric collation:", column);

词典排序位置 "10"之前"2"因为"1" < "2"而不是检查整个数字。如果你们也有相同的名字，这也可以工作:

const column = [ "file_1", "file_3", "file_10", "file_24", "file_212" ];

column.sort((a, b) => a.localeCompare(b));
console.log("lexicographical sort:", column);

column.sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
console.log("sort with numeric collation:", column);

但在某些情况下可能不受欢迎，如果您不想将数字视为一个整体单位:

const column = [ "1 Somewhere Street", "3 Some Avenue", "10 Some Avenue", "24 Parking", "212 Whatever Road" ];

column.sort((a, b) => a.localeCompare(b));
console.log("lexicographical sort:", column);

column.sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
console.log("sort with numeric collation:", column);

column.sort((a, b) => {
  const regex = /^(\d+)\s+(.*)/;
  const [, numericA, stringA] = a.match(regex);
  const [, numericB, stringB] = b.match(regex);
  
  return stringA.localeCompare(stringB) 
    || numericA.localeCompare(numericB, undefined, { numeric: true })
});
console.log("sort with starting numerics treated last:", column);

因此，这取决于您的数据是什么样子以及您希望如何呈现。