On Fri, Jul 12, 2013 at 1:42 PM, Andrew Fedoniouk <[email protected] > wrote:
> On Fri, Jul 12, 2013 at 6:45 AM, Rick Waldron <[email protected]> > wrote: > > > > > > > > On Fri, Jul 12, 2013 at 12:22 AM, Andrew Fedoniouk > > <[email protected]> wrote: > >> > >> Quite often I see constructions like this: > >> > >> foo({one:1,two:2}); > >> > >> so call of function with single parameter - object literal. > >> Idiom named "Poor man named arguments passing" > >> > >> Idea is to extend existing JS/ES syntax calls to support > >> simple form of the call above: > >> > >> foo {one:1,two:2 }; > >> > >> Semi-formally that syntax looks like: > >> > >> function-call: > >> <name-token> '(' <parameter-list> ')' // existing form > >> <name-token> <object-literal> // proposal > > > > > > Given: > > > > function foo(){ return 1; } > > > > > > This is a valid function call: > > > > foo > > () > > > > // 1; > > > > But this is valid, too (though, not a function call): > > > > foo <-- identifier > > {} <-- empty block > > > > // function foo() { return 1; } > > > > This construction > > foo {}; > > is an equivalent of: > > foo({}); > > but not > > foo(); > Right, I get that... but what I'm telling you is that your proposal doesn't work: foo {} Same as foo({}) So, that means: foo {} should be the same as foo ({}) ...Because this is a valid function call. But it's not the same and cannot be defined as the same, because ASI put a semi colon at the end of |foo| and {} is a valid empty block. Changing this would surely be web breaking. Rick > To call function with empty param list you still need empty '('')' > brackets. > > > > > Also, I could be wrong, but wouldn't there need to be a way to > disambiguate > > UnaryExpression? > > > > typeof foo { one: 1, two: 2 } > > > > Maybe this is not an issue, or easily dealt with? > > This is not an issue. Parsed exactly the same as: > typeof foo({ one: 1, two: 2 }) > Right, but again: function foo() {return 1;} typeof foo ({}) "number" ...Because this is the same as typeof foo({}) So you need a [no LineTerminator here], which unnecessarily complicates: CallExpression Arguments CallExpression[no LineTerminator here]ObjectLiteral Rick
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