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If

If[condition, t, f]
gives t if condition evaluates to True, and f if it evaluates to False.
If[condition, t, f, u]
gives u if condition evaluates to neither True nor False.
  • If evaluates only the argument determined by the value of the condition.
  • If[condition, t, f] is left unevaluated if condition evaluates to neither True nor False.
  • If[condition, t] gives Null if condition evaluates to False.
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