Right now [].reduce doesn't take an optional thisArg, so the callback is always called with |null| for |this| per 9.c.ii.
The Array prototype object take an optional thisArg for every, some, forEach, map, and filter; so it would be good to make reduce consistent with the rest. The new parameter list for Array.prototype.reduce would then be.. 15.4.4.21 Array.prototype.reduce ( callbackfn [ , initialValue [ , thisArg ] ] ) Insert after step 4: #. If thisArg was supplied, let T be thisArg; else let T be undefined. For step 9.c.ii, replace: "callbackfn with null as the this value" with.. "callbackfn with T as the this value" Similarly, this should be applied to reduceRight as well: 15.4.4.22 Array.prototype.reduceRight ( callbackfn [ , initialValue [ , thisArg ] ] ) The only remaining Array callback is sort, which could be updated as well: 15.4.4.11 Array.prototype.sort ( comparefn [, thisArg ] ) Ed _______________________________________________ Es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
