value String -- evaluate a string

value String -- evaluate a string

Synopsis:

Usage: x = value s

Function: value -- evaluate

Input:

s, an instance of class String:

Output:

x, an instance of class Thing: the value of s

The contents of s are treated as code in the Macaulay 2 language, parsed it in its own scope (the same way a file is) and evaluated. The string may even contain multiple lines.

i1 : value "2 + 2"



o1 = 4

i2 : value "a := 33

     a+a"



o2 = 66

i3 : a



o3 = a



o3 : Symbol

Since the local assignment to a above occurred in a new scope, the value of the global variable a is unaffected.