> On 03 Jan 2015, at 19:52, Brendan Eich <bren...@mozilla.org> wrote: > > None of the objects in the examples bz cited are Arrays -- what did you mean?
When I though of `+` being used inside square brackets, I only thought of strings, not of numbers (first example). In the first example, `this` is at least array-like. Otherwise, `slice` wouldn’t work. > Axel Rauschmayer wrote: >> Arrays are a good point, this is where I’d think accidental coercions are >> most likely. The other use case is object-as-dictionary, which will slowly >> be replaced by `Object.create(null)` (no need to escape in ES6+) and `Map`. >> >> I don’t feel strongly either way, I just feel that the added spec complexity >> is not ideal. Especially ToBoolean() not throwing an exception, while >> ToString() and ToNumber() do. >> >>> On 03 Jan 2015, at 04:02, Boris Zbarsky <bzbar...@mit.edu >>> <mailto:bzbar...@mit.edu>> wrote: >>> >>> On 1/2/15 9:40 PM, Axel Rauschmayer wrote: >>>> Can you give an example? >>> >>> get: function( num ) { >>> return num != null ? >>> >>> // Return just the one element from the set >>> ( num < 0 ? this[ num + this.length ] : this[ num ] ) : >>> >>> // Return all the elements in a clean array >>> slice.call( this ); >>> }, >>> >>> That's from jQuery 2.1.3. >>> >>> And from the same place: >>> >>> function cache( key, value ) { >>> // Use (key + " ") to avoid collision with native prototype properties (see >>> Issue #157) >>> if ( keys.push( key + " " ) > Expr.cacheLength ) { >>> // Only keep the most recent entries >>> delete cache[ keys.shift() ]; >>> } >>> return (cache[ key + " " ] = value); >>> } -- Dr. Axel Rauschmayer a...@rauschma.de rauschma.de
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