As everyone else has said, short answer, "no, but it helps". From a hiring point of view it makes the decision much easier when you have a point of reference for what someone can do/has already done. If you don't have a portfolio of some description it's much harder to convince potential employers of the high quality of your code, particularly when you're very early in your career. Not sure about elsewhere, but a lot of roles here in the UK stipulate 'salary up to X depending on experience', so the more you can do to demonstrate that experience the easier it will be to justify starting on a higher salary.
That said, everyone's situation is different and employers are seemingly recognising that more and more - and also recognising that non-tech skills are just as important as the actual coding skills in terms of the perspective they give you. Posting on here doesn't hurt either ;)
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As everyone else has said, short answer, "no, but it helps". From a hiring point of view it makes the decision much easier when you have a point of reference for what someone can do/has already done. If you don't have a portfolio of some description it's much harder to convince potential employers of the high quality of your code, particularly when you're very early in your career. Not sure about elsewhere, but a lot of roles here in the UK stipulate 'salary up to X depending on experience', so the more you can do to demonstrate that experience the easier it will be to justify starting on a higher salary.
That said, everyone's situation is different and employers are seemingly recognising that more and more - and also recognising that non-tech skills are just as important as the actual coding skills in terms of the perspective they give you. Posting on here doesn't hurt either ;)