Evaluating a string as a mathematical expression in JavaScript

Question

How do I parse and evaluate a mathematical expression in a string (e.g. \'1+1\') without invoking eval(string) to yield its numerical value?

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Answer 1

I went looking for JavaScript libraries for evaluating mathematical expressions, and found these two promising candidates:

• JavaScript Expression Evaluator: Smaller and hopefully more light-weight. Allows algebraic expressions, substitutions and a number of functions.

• mathjs: Allows complex numbers, matrices and units as well. Built to be used by both in-browser JavaScript and Node.js.