javascript - Querying for non existent property doesn't always throw error -

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why when executing piece of code, checking thisthrowserror throws error, querying non existent property on prototype object or on this context doesn't?

function test() {      if(this.somevar){}     if(test.prototype.somevar){}       if(thisthrowserror){}  }  var test = new test();

see: why undefined variable in javascript evaluate false , throw uncaught referenceerror?


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