evaluate

evaluate s -- treating the contents of the string s as code in the Macaulay 2 language, parse it in its own scope, evaluate it and return the value.

     i1 = evaluate "2+2"
     
     o1 = 4

     i2 = evaluate "a :=2"
     
     o2 = 2

     i3 = a
     
     o3 = a
     
     o3 : Symbol

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