javascript - Why leave a trailing comma after a key value pair in an object literal? -


i looking @ gruntjs , looked @ json examples used configure grunt tasks.

here example of json:

grunt.initconfig({   concat: {     foo: {       // concat task "foo" target options , files go here.     },     bar: {       // concat task "bar" target options , files go here.     },   },   uglify: {     bar: {       // uglify task "bar" target options , files go here.     },   }, });

as can see, there 'extra' comma after each of bar properties. tried notation in chrome , valid. although valid, wouldn't use notation why people use it?

i tried notation in chrome , valid.

simply because works in chrome doesn't mean it's valid. valid because the spec says so :-)

i wouldn't use notation why people use it?

to make copy&pasting easier. can append new properties without caring additional work. it's bad practice in program code because older browsers (notably ie) , es3 spec disallow them, in config file (i.e. in known environment) makes life easier.


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