const number = 1000000
number.toLocaleString() // 1,000,000
常用時間戳為1970年1月1日的毫秒數
+new Date()
const string = '10000'
+string // 10000
const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
eval(array.join('+')) // 55
const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
array.reduce((a, b) => a + b) // 55
const array = ['apple', 'banana', 'banana', 'apple', 'banana']
[...new Set(array)] // ['apple', 'banana']
const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
array.sort(() => Math.random() - 0.5) // [3, 7, 9, 4, 2, 5, 6, 8, 10, 1]
(1e6).toLocaleString('zh-tw', { style: 'currency', currency: 'TWD' })
// $1,000,000.00
const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Math.max(...array) // 10
Math.min(...array) // 1
Array(10).fill().map((i, id) => id + 1)
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]