如何破壞對象中的數字數組並在javascript中合並為一個？

Question

我有這個對象：

const memorized = [
 {
  verses: [1, 2, 3, 4, 5],
  when: '2022 Jan 14'
 },
 {
  verses: [6, 7, 8, 9]
  when: '2022 Jan 15'
 },
 {
  verses: [10, 11, 12, 13, 14, 15]
  when: '2022 Jan 16'
 },
...
]

Answer 1

映射時無需推送 - 那是浪費數組

要么推入一個 forEach 要么只是 flatMap 數組

 const memorized = [ { verses: [1, 2, 3, 4, 5], when: '2022 Jan 14' }, { verses: [6, 7, 8, 9], when: '2022 Jan 15' }, { verses: [10, 11, 12, 13, 14, 15], when: '2022 Jan 16' } ]; const total_verses = memorized.flatMap(({ verses }) => verses) console.log(total_verses);