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Transformation operator: scan

Transformation operator: scan

5:21
All of the combination operators take two or more observables as input. These operators may also be alternatively called "vertical combination operators", because of how they work in a marble diagram. Next, we will learn about scan(), which is an important "horizontal combination operator".
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egghead.io

All of the combination operators take two or more observables as input. These operators may also be alternatively called "vertical combination operators", because of how they work in a marble diagram. Next, we will learn about scan(), which is an important "horizontal combination operator".

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Steve Lee

Rather than (hel) - 3 separate characters - shouldn't the result be 'hel' - a string. I was thinking acc+x will be string catenation given the seed is a the empty string. Am I missing something?

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Andre

Hi Steve. We took some freedom to write it more concisely. The precisely correct way of writing it would be ('hel'), but it would take too much space in the diagram.

In reply to Steve Lee
HEY, QUICK QUESTION!
Joel's Head
Why are we asking?