using-map.js

function citiesOnly(states) {
    let array = states.map(cites => {
        return cites.city
    })
    return array
}

function upperCasingStates(cities) {
    let array = cities.map(function city(currentValue) {
        const regex = /^\w/g
        const regexSpace = /\s\w/g
        const regexSp = new RegExp(regexSpace)
        const regexSt = new RegExp(regex)
        let res1 = currentValue.match(regexSt)
        let res2 = currentValue.match(regexSp)
        let res = currentValue.replace(regexSt, res1[0].toUpperCase())
        if (res2 !== null) {
            res = res.replace(regexSp, res2[0].toUpperCase())
        }
        return res
    })
    return array
}

function fahrenheitToCelsius(temperature) {
    let array = temperature.map(function Celsia(value) {
        value = parseInt(value)
        let cel = (value - 32) * 5 / 9
        cel = Math.floor(cel)
        return cel + '°C'
    })
    return array
}

function trimTemp(states) {
    let array = states.map(temp => {
        const regex = /\s/g
        const resRegex = new RegExp(regex)
        let strin = temp.temperature
        let str = strin.match(resRegex)
        let res = strin.replace(resRegex, '')
        temp.temperature = res
        return temp
    })
    return array
}

function tempForecasts(states) {
    let array = states.map(all => {
        const regex = /\s/g
        const resRegex = new RegExp(regex)
        const regexSpace = /\s\w/g
        const regexSp = new RegExp(regexSpace)
        let strin = all.temperature
        let res2 = all.state.match(regexSp)
        let str = strin.match(resRegex)
            // let res3 = all.state.match(regexSp)
        let res = strin.replace(resRegex, '')
        if (res2 !== null) {
            all.state = all.state.replace(regexSp, res2[0].toUpperCase())
        }
        res = parseInt(res)
        let cel = (res - 32) * 5 / 9
        cel = Math.floor(cel)
        let strRes = cel + '°Celsius in ' + all.city + ', ' + all.state[0].toUpperCase() + all.state.slice(1)
        return strRes
    })
    return array
}
// console.log(tempForecasts(states))