Recursive Promise Resolution

RecursivePromise.js

// With Lodash
let resolveAll    = P => {
        let map   = ( pl, next ) => Promise.all( pl.map( p => Promise.resolve( p ).then( next ) ) ),
            props = o => {
                let pToR = [];
                _.map( _.keys( o ), k => pToR.push( Promise.resolve( o[ k ] ).then( v => _.set( o, k, v ) ) ) );
                return Promise.all( pToR ).return( o );
            },
            rNP   = o => Promise.resolve( o ).then( o => {
                    if( _.isArray( o ) ) return map( o, rNP );
                    else if( _.isPlainObject( o ) ) {
                        let oa = {};
                        for( let ka in o ) oa[ ka ] = rNP( o[ ka ] );
                        return props( oa );
                    }
                    return o;
            } );
        return ( rNP )( P );
    };

// Native Code
let resolveAll = P => {
        let map   = ( pl, n ) => Promise.all( pl.map( p => Promise.resolve( p ).then( n ) ) ),
            props = o => {
                let arr = [];
                Object.keys( o ).map( k => arr.push( Promise.resolve( o[ k ] ).then( v => ( o[ k ] = v, o ) ) ) );
                return Promise.all( arr ).then( () => ( o ) );
            },
            rNP   = o => Promise.resolve( o ).then( o => {
                    if( Array.isArray( o ) ) return map( o, rNP );
                    else if( typeof o === 'object' ) {
                        let oa = {};
                        for( let ka in o ) oa[ ka ] = rNP( o[ ka ] );
                        return props( oa );
                    }
                    return o;
            } );
        return ( rNP )( P );
    };