変換前の配列：array1 = [ 年, 月, 日, 人数1, 人数2, ... , 人数47 ];
変換後の配列：array2 = [ 年, 月, 日, 人数1～人数47の合計 ];
つまり、人数を合計したい。
let array2 = array1.slice(0, 3).concat(array1.slice(3).reduce((a, x) => { return a + x }));
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【JavaScript】配列の一部だけを合計して新しい配列を作る
Last updated at Posted at 2020-04-17
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