wft-utils/just-play/hand-writing/str.js

The commonly used tool functions in daily development

// 手写一个 trim 方法
function myTrim(str) {
  if (typeof str !== 'string') return ''
  if (str.split('').every(str => str === ' ')) return ''
  let start = 0
  let end = str.length - 1
  for (let i = 0; i < str.length; i++) {
    if (str[i] !== ' ') {
      start = i
      break
    }
  }
  for (let i = str.length - 1; i >= 0; i--) {
    if (str[i] !== ' ') {
      end = i
      break
    }
  }
  return str.slice(start, end + 1)
}