假设我们有一个这样的数组数组-
const arr = [ [ "Serta", "Black Friday" ], [ "Serta", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ] ];
我们需要编写一个包含一个这样的数组的JavaScript函数。并且该函数应返回一个新数组,其中包含原始数组中的所有唯一子数组。
为此的代码将是-
const arr = [ [ "Serta", "Black Friday" ], [ "Serta", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ], [ "Simmons", "Black Friday" ] ]; const filterCommon = arr => { const map = Object.create(null); let res = []; res = arr.filter(el => { const str = JSON.stringify(el); const bool = !map[str]; map[str] = true; return bool; }); return res; }; console.log(filterCommon(arr));
输出结果
控制台中的输出-
[ [ 'Serta', 'Black Friday' ], [ 'Simmons', 'Black Friday' ] ]