// 57: Default parameters - basics
// To do: make all tests pass, leave the assert lines unchanged!
// Follow the hints of the failure messages!

describe('Default parameters make function parameters more flexible', () => {
  it('define it using an assignment to the parameter `function(param=1){}`', function() {
    let number = (int = 0) => int;
    assert.equal(number(), 0);
  });
  it('it is used when `undefined` is passed', function() {
    let number = (int = 23) => int;
    const param = undefined;
    assert.equal(number(param), 23);
  });
  it('it is not used when a value is given', function() {
    function xhr(method) {
      return method;
    }
    assert.equal(xhr('POST'), 'POST');
  });
  it('it is evaluated at run time', function() {
    let defaultValue = 42;
    function xhr(method = `value: ${defaultValue}`) {
      return method;
    }
    assert.equal(xhr(), 'value: 42');
  });
  it('it can also be a function', function() {
    const defaultValue = (ok) => defaultValue;
    function fn(value = defaultValue) {
      return value;
    }
    assert.equal(fn(), 'defaultValue');
  });
});