javascript - jQuery expression as object key -

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• how create object property variable value in javascript? [duplicate] 9 answers
• dynamically access object property using variable 10 answers

i need figure out how create dynamic key string object. expression makes javascript complain.

return {$(this).val(): true};      // returns object e.g. {2: true} 

what doing wrong?

you have create object, use bracket notation dynamic key

var obj = {}; var val = $(this).val();  obj[val] = true;  return obj; 

or unnecessary one-liner

return (function(o,e) {o[e.value]=true; return o;})({}, this);