mvf.md

Function Tree

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Multi-variable functions

function-tree defines a class called MultiVariableFunction that constructs a function-like object from a string representation of a multi-variable function.

final f = MultiVariableFunction(
  fromExpression: '4 * a + 2 * b', 
  withVariables: ['a', 'b']
);
print(f({'a': 10, 'b': 1}));

42.0

A more succinct way to construct a MultiVariableFunction instance is directly from a string:

final f = 'sin(x) * cos(y)'.toMultiVariableFunction(['x', 'y']);
print(f({'x': 0.5, 'y': 0.5}));

0.42073549240394825