nl_tokens: Recursively walk
pl_tokens: function pluckDeepWithSelectors ( coll , selectors ) { // No more selectors if ( ! selectors . length ) return coll ; // Pluck the current value from the given selector let sel = selectors [ 0 ] ; let filtered = coll ; // Filter if applicable const filter = parseFilter ( sel ) ; if ( filter ) { filtered = filterColl ( coll , filter ) ; if ( ! filtered || ( Array . isArray ( filtered ) && ! filtered . length ) ) return null ; sel = filter . selector ; } const p = pluck ( filtered , sel ) ; // No values found for current selector if ( isUndef ( p ) || ( Array . isArray ( p ) && p . some ( isUndef ) ) ) { return null ; } // Recursively call with the remaining selectors return pluckDeepWithSelectors ( p , selectors . <mask> ( 1 ) ) ; }