Add a new function "try_get_value"

[dmitryilyin]

Extracts a value from a deeply-nested data structure

$data = {
'a' => {
'b' => [
'b1',
'b2',
'b3',
]
}
}

$value = fetch($data, 'a/b/2')
=> $value = 'b3'

[DavidS]

Please put this in the right alphabetical order of the function list.

[DavidS]

Hi, thank you for your contribution! I've added a few inline tests about possible improvements for the code.

Cheers, David

[dmitryilyin]

Updated request with fixes

[DavidS]

You can shorten your tests even more by sharing data between examples:

context 'with nested hashes' do
  let(:data) { { 'a' => { 'b' => 'c' } } }
  it 'should return the default value if the path is not found' do
    is_expected.to run.with_params(data, 'missing', 'default').and_return('default')
  end
  it 'should return the default value if the path is too long' do
    is_expected.to run.with_params(data, 'a/b/c/d', 'default').and_return('default')
  end
end

[DavidS]

These changes look great. I've added another small comment to the tests.

We've been discussing names internally and came up with try_get_value to avoid confusion with filesystem paths and to indicate that it will not throw any exceptions.

[DavidS]

Thank you for your contribution and patience!