How should I practice Snake-Case Iterator to Camel Case?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Navan phone screen problems in FastPrep.

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FastPrep tags this as a Navan phone screen coding practice problem when the problem catalog has that company and stage context.

Snake-Case Iterator to Camel Case

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Problem statement

Convert the lowercase snake-case string produced by an iterator to camel case.

Preserve every leading and trailing underscore. Inside the remaining text, remove each nonempty run of underscores and uppercase the first following letter. If the input contains only underscores, return it unchanged.

Function

snakeIteratorToCamel(text: String) → String

Examples

Example 1

text = "__hello__world___"return = "__helloWorld___"

Leading and trailing underscores are preserved, while the interior separator starts a new camel-case word.

Example 2

text = "___"return = "___"

An all-underscore input is unchanged.

Constraints

1 <= text.length <= 200000.
text contains only lowercase English letters and underscores.