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(89) :when(condition, ifTrue[, ifFalse[, undefined]])

This exaluates a condition. If the condition is true, ifTrue is returned. If the condition is false, ifFalse is returned. If condition is indeterminate, undefined is returned.

ExampleEdit

:DelVar x
:1y
:
:when(y=1,0)      :"returns 0"
:when(y=0,0)      :"does not evaluate"
:when(x=0,0)      :"does not evaluate"
:when(y=1,0,2)    :"returns 0"
:when(y=0,0,2)    :"returns 2"
:when(x=0,0,2)    :"does not evaluate"
:when(y=1,0,2,4)  :"returns 0"
:when(y=0,0,2,4)  :"returns 2"
:when(x=0,0,2,4)  :"returns 4

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