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based on an earlier version of the Wolfram Language.
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Conditionals
Mathematica's symbolic character allows a powerful unification of the notion of conditionals in programming and in mathematics.
Equal(Equal ▪ Unequal(NotEqual ▪ SameQ(SameQ ▪ And(&& ▪ IntegerQ  ▪ ...
    
Procedural Conditionals
If test if a condition is true, false, or of unknown truth value
Which test which of a sequence of conditions are true
Switch switch based on a value, with patterns allowed
    
Piecewise an arbitrary piecewise function
UnitStep  ▪ Sign  ▪ Mod  ▪ Floor  ▪ Boole  ▪ DiscreteIndicator  ▪ ...
    
Replace replace an expression if a rule applies
Condition (/;) — specify an arbitrary condition for a pattern to match
NestWhile  ▪ TakeWhile  ▪ ...
Select  ▪ Cases  ▪ Pick  ▪ ...
    
Program Execution Conditionals
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