https://leetcode.com/problems/largest-number/

largestNumber.js

const largestNumber =
    xs =>
        headIsZero(
            mapInPlace( toString , xs )
            .sort( byBestOrderForLargestNumber ) )
        ? '0'
        : xs.join( '' )

const byBestOrderForLargestNumber =
    ( x , y ) => x + y < y + x || -1

const mapInPlace =
    ( f , xs ) =>
        ( xs.forEach( ( x , i ) => xs[ i ] = f( x ) )
        , xs )

const toString =
    x => x.toString()

const headIsZero =
    ( [ x ] ) => x === '0'