Explain the Difference Between a Control and a Variable

I want to know what is the difference between null and undefined in typescript. Whats the difference between reliability and validity.

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Validity refers to the accuracy of a measure whether the results really do represent what they are supposed to measure.

. Reliability and validity are both about how well a method measures something. But in typescript I want to know the difference exactly. I know in javascript it is possible to use both of them in order to check a variable has no value.

Reliability refers to the consistency of a measure whether the results can be reproduced under the same conditions.

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