String all word first character capitalization JavaScript function

 const capitalizeString = (values) => {

//function values set initially

    let str = values

// split string word and create array 

    let data = str.split(" ")

// create null array

    let arrayJoin = []

// data push into array and perform all word first word capital

    let co = data.map(data => {

      arrayJoin.push(data.charAt(0).toUpperCase() + data.slice(1))

    })

// combine array values into single string

    let perfect = arrayJoin.join(" ")

    return perfect

  }