[inline] Support for Object Methods

[kungfooman]

Not everyone knows this function-in-object-shorthand trick (known as an ObjectMethod in e.g. Babel AST), but I like it:

const methods = {
  mul(a, b) {
    return a * b;
  },
  pow(a, b) {
    return a ** b;
  },
};
const R201 = Algebra(2,0,1);
const mul = R201.inline(methods.mul);
console.log(mul);

However, it doesn't work right now. A workaround for the inline function:

  var txt = (intxt instanceof Function) ? intxt.toString() : `function(){return (${intxt})}`;
  // Handle methods in object notation like: {mul(a, b) {return a * b;}}
  if (!(txt.startsWith('(') || txt.startsWith('function'))) {
    txt = 'function ' + txt;
  }

Currently it just fails:

Uncaught SyntaxError: Unexpected token '{'
at Element.inline (ganja.js:1852:136)
    at <anonymous>:10:18

Demo: https://enki.ws/ganja.js/examples/coffeeshop.html#NG7DYcbaq