svf.md

Function Tree

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Single variable functions

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

final f = SingleVariableFunction(fromExpression: '3 * cosh(x)');
print(f(3));

30.202985987333292

By default, 'x' is taken to be the variable; if this is not what we want, we can state the name of the variable:

final f = SingleVariableFunction(
  fromExpression: '3 * cosh(a)', 
  withVariable: 'a'
);
print(f(3));

30.202985987333292

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

final f = '3 * x'.toSingleVariableFunction();
print(f(100));

300.0