Allow restricting the use of certain operators

[haykam821]

Thanks for the module!

One use case that I don't see implemented already is away to blacklist operators from being in the expression. This could be achieved by a new property, excludeOperators containing an array of operators (+, -, *, or /) to exclude.

In order to only allow addition:

const { generateExpression } = require("math-expression-generator");
const expression = generateExpression({
    target: 20,
    length: 3,
    excludeOperators: ["-", "*", "/"],
});

[bent0b0x]

Hey @haykam821, good suggestion.

I will look into adding this (no guarantee on quick timeline, unfortunately 😓)