数字马力 笔试

2023-04-14 15:27:07

字符串转小驼峰

const str = 'background-image'

function toLower(s) {
  const result = s.split('-')
  let res = ''
  console.log(result)
  result.map((item, index) => {
    if (index > 0) {
      item.split('').map((it, idx) => {
        if (idx > 0) {
          res += it
        } else {
          res += it.toLocaleUpperCase()
        }
      })
    } else {
      res += item
    }
  })
  return res
}

数组拼接

• 略

实现flat 递归

const _flatten = arr => {
  const res = []
  arr.map(item => {
    if (Array.isArray(item)) {
      res.push(..._flatten(item))
    } else {
      res.push(item)
    }
  })
  return res
}

// console.log(_flatten([1,[2,[3,[4]]]]))

找到字符串中连续的第一组三个数字

function captureThreeNumbers(str) {
  let res = ''
  for (let i = 0; i < str.length; i++) {
    if (
      Number(str[i] + 1) === Number(str[i + 1]) &&
      Number(str[i] + 2) === Number(str[i + 2])
    ) {
      console.log('升序')
      res = str[i] + str[i + 1] + str[i + 2]
      return res
    } else if (
      Number(str[i] - 1) === Number(str[i + 1]) &&
      Number(str[i] - 2) === Number(str[i + 2])
    ) {
      console.log('降序')
      res = str[i] + str[i + 1] + str[i + 2]
      return res
    }
  }
}

// console.log(captureThreeNumbers('9876543'))

深拷贝

function deepClone(source) {
  const target = {}
  for (property in source) {
    if (typeof source[property] === 'object') {
      target[property] = deepClone(source[property])
    } else {
      target[property] = source[property]
    }
  }
  return target
}