angularjs - Javascript If condition to check a variable with empty object or not -


i have variable var = {};

if ( !==null) { // entering here if var has empty object don't want enter. }  if (a == null) { // want enter condition if var has empty object. }

i have tried several ways write condition giving a=={} still entering first condition. please let me know appropriate way check condition?

first option

var = null;

second option 

if ( !==null && json.stringify(a) !== '{}') {..}

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