Implement more LISP operators

[tshemsedinov]

• Arithmetic Operations
• Comparison Operations
• Logical Operations
• Bitwise Operations

[zpwebbear]

Can I use list of operators and their declaration (incf, decf, logand, etc) from this resource https://www.tutorialspoint.com/lisp/lisp_operators.htm ? Unfortunately I haven't managed to find these operators in the comfortable human readable list from the official common-lisp resources.

And do I need to extend the test/cases.js file or implement new files for each operator? Can I use describe for grouping tests like on the example below:

describe('Arithmetic Operations', () => {
  it('Evaluate subtract operator', () => {
    const program = '(- x y)';
    const context = { x: 5, y: 2 };
    const result = evaluate(program, context);
    const expected = 5 - 2;
    assert.strictEqual(result, expected, 'Subtract operator failed');
  });
  
  //... other arithmetic operators tests
});

[imbroyury]

@tshemsedinov Should comparison operators support sequences of more than two arguments?

From Common Lisp the Language, 2nd Edition

(= 3 3) is true.		(/= 3 3) is false. 
(= 3 5) is false.		(/= 3 5) is true. 
(= 3 3 3 3) is true.		(/= 3 3 3 3) is false. 
(= 3 3 5 3) is false.		(/= 3 3 5 3) is false. 
(= 3 6 5 2) is false.		(/= 3 6 5 2) is true. 

[zpwebbear]

@imbroyury Great question! I think it's relevant for the arithmetical operators too.

Don't you want to share this issue? I've already started with arithmetic operators and can go logical or bitwise, and you can take comparison and something you want.

And also thanks for the common lisp resource. It's really strange that I missed it.

[zpwebbear]

@tshemsedinov I've created a pull request with an implementation of arithmetic operators. But I'm not experienced in open source and because of it don't know how to attach this PR to this particular issue #11

[imbroyury]

@zpwebbear happy to implement comparison operators as soon as @tshemsedinov comments on supporting sequences and your commit is merged

[zpwebbear]

@tshemsedinov also to implement Logical Operators we need to implement nil and t symbols. Do we need to do it in the scope of the current issue or we'll make special issue for it?

[zpwebbear]

@tshemsedinov I've added the boolean symbols implementation in the separate PR #12 Could you please take a look?

For some reason I can't assign any reviewer on this PR.