Jeb Nicholson Jeb Nicholson - 1 month ago 6
Swift Question

How do I turn a string into a maths equation?

A user will give me a string as their input, which will be a maths equation. E.g. (21 + 3) / 4.

I want to turn that string into a double that is equal to the answer (6.0) Is there any way to do this in swift 3, XCode 8?

Answer

You can see if NSExpression will suit your task. It’s a bit more limited than a full math expression parser but it’ll still cover even slightly complicated tasks:

Apple reference for NSExpression

Evaluating Expressions in iOS with Objective-C and Swift

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