去除字符串空白和数组去重

一、实现 trim

function trim(){
    return this.replace(/^\s+|\s+$/,'')
}

二、数组去重

1. hash 表

function unique(array){
  let temp = []
  let hash = {}
  for (let i=0;i<array.length;i++){
    if(!hash[array[i]]){
    hash[array[i]] = true
    temp.push(array[i])  
    }
  }
  return temp
}
let array = unique([3,4,6,7,6,5,4,4,3,5,6])
console.log(array)
// [3, 4, 6, 7, 5]

2. new Set()

let array = [...new Set([3,4,6,7,6,5,4,4,3,5,6])]
console.log(array)
// [3, 4, 6, 7, 5]

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