checking array elements

[oprogramador]

// this fails:
expect([{ foo: 123 }, { foo: 456 }]).to.matchPattern([{ foo: _.isNumber }]);

// this passes:
expect([{ foo: 123 }, { foo: 456 }]).to.matchPattern(x => x.length > 0 && x.map(y => expect(y).to.matchPattern({ foo: _.isNumber })));

What do you think about making the first expectation passing?

And it would be good to have a simpler way to write the second expectation (the additional check is length above 0).

Maybe the interface could be similar to Joi.