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var exp = '1+2*3/4^5%6',
res = Shunt.parse(exp); // Number(1.005859375);
Creating a context in which you can define variables and functions for use in expressions using Shunt.Context()
// using a context for functions and constants
var ctx = new Shunt.Context();
ctx.def('abs'); // wraps `Math.abs`
// create a variable
ctx.def('foo', 1.5); // defines constant `foo`
// functions take parameters as you'd expect
ctx.def('bar', function(a, b) { return a * b; }); // defines function `bar`
var exp2 = 'foo + bar(2 + 4, abs(-1000))',
res2 = Shunt.parse(exp2, ctx); // Number(6001.5);