js> Map() ({}) // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-map-iterable steps 1-2 js> Set() ({}) // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-set-iterable steps 1-2 js> WeakMap() ({}) // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-weakmap-iterable steps 1-2 js> ArrayBuffer() ({}) // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-arraybuffer-length steps 1-2 js> DataView(ArrayBuffer()) ({}) // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-dataview-buffer-byteoffset-bytelength steps 1-2 According to the spec, these should all throw an exception like Promise does devtools>Promise() TypeError: Constructor Promise requires 'new' The discussion thread is here: http://esdiscuss.org/topic/promise-vs-new-promise

There is bug 980945 for typed arrays specifically, but we don't yet have a tracking bug for this. Turning this into one.

I think we are done here.

Added a note to https://www.fxsitecompat.com/en-US/docs/2015/calling-typed-array-constructors-without-new-will-throw/