JavaScript Why obj.a = ( obj.a || [] ).push( 10 ) makes obj.a as type number

I am trying to push a value to a property of an array like below

 var obj = {};
 obj.a = (obj.a || []).push(10);
 console.log( typeof obj.a ); // Returning number  

How can correct this to keep obj.a as an array?

Answer:1

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