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Learning simple programming conventions

Where can I learn more about simple programming conventions and design patterns?

When I say simple I mean which is the preferred way of writing the following equivalent functions:

function() {
  if (condition) {
    # condition wraps the entire function
  }
}

or

function() {
  if (!condition) {
    return;
  }

  # rest of the function
}

There's also this:

function() {
  $return_val = 'foo';

  if (condition) {
    $return_val = 'bar';
  }

  return $return_val;
}

vs this:

function() {
  if (condition) {
    return 'bar';
  }

  return 'foo';
}

Are these arbitrary differences or is are there established idioms for such things?

Solution

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