Return key, value object with dynamic key name

Question

In PEG.js I have the following rule

label  = l:[a-zA-Z\$\#\% ]*  { return word(l); } 
block  = "[" l:label "]" { return l; }
option = "\n"* key:block value:label "\n"? {return {key : value}; }

If it parses [hello] world it results in:

{"key": "world"}.

I would like it to return

{"hello": "world"}.

Is this possible? How can I make sure the object key accepts a dynamic value.

See also: http://stackoverflow.com/questions/6500573/dynamic-keys-for-object-literals-in-javascript — Phrogz, Feb 21 '14 at 16:33

score 3 · Accepted Answer · answered Feb 21 '14 at 16:29

3

Change

… { return {key : value}; }

to

… { var o={}; o[key]=value; return o; }

answered Feb 21 '14 at 16:29

Phrogz

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Yes, using square-bracket notation is the only way to set a dynamic property name. – Scott Rippey Feb 21 '14 at 16:39

Return key, value object with dynamic key name

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