const f1 = () => {}

const f2 = () => {}

const f3 = () => {}

const f4 = () => {}

const f5 = () => {}

​

function getFnIf(level) {

    if (level === "info") return f1;

    else if (level === "warn") return f2;

    else if (level === "error") return f3;

    else if (level === "fatal") return f4;

    else return f5;

}

​

function getFnSwitch(level) {

    switch (level) {

        case "warn":

            return f1;

        case "info":

            return f2;

        case "error":

            return f3;

        case "fatal":

            return f4;

        default:

            return f5;

    }

}

​

const lookup = {

    'info': f1,

    'warn': f2,

    'error': f3,

    'fatal': f4

}

​

function getFnLookupString(level) {

    return lookup[level] || f5

}

​

const lookupN = {

    '1': f1,

    '2': f2,

    '3': f3,

    '4': f4

}

​

function getFnLookupN(level) {

    return lookupN[level] || f5

}

​

const arr = [f1,f2,f3,f4,f5]

function getFnLookupA(level) {

    return arr[level] || f5

}