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Asked: 2026-06-17T21:34:44+00:00

Possible Duplicate: Is there a standard function to check for null, undefined, or blank

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Possible Duplicate:
Is there a standard function to check for null, undefined, or blank variables in JavaScript?

How is a condition inside the if statement evaluated to true or false in JavaScript?

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1 Answer

  1. Editorial Team

    Whatever the result of the condition expression is, it is converted to a Boolean by ToBoolean:

    1. Let exprRef be the result of evaluating Expression.
    2. If ToBoolean(GetValue(exprRef)) is true, then
      Return the result of evaluating the first Statement.
    3. Else,
      Return the result of evaluating the second Statement.

    For each data type or value, the conversion rules to a Boolean are clearly defined. So, for example, undefined and null are both converted to false.

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