Function prependZero

chapter-07/mounting-lifecycle-clock/src/lib.js:25–31

    })

export const prependZero = key => clockTime =>
    ({
        ...clockTime,
        [key]: (clockTime[key] < 10) ?
        "0" + clockTime[key] :
            clockTime[key]
    })

export const compose = (...fns) =>
    (arg) =>