How should I practice Longest Even-Length Word?

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

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Problem · String

Longest Even-Length Word

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● Easy

WalmartFULLTIMEPHONE SCREEN

Problem statement

Return the longest even-length word in a nullable text value. Words are maximal non-empty runs of non-whitespace ASCII characters. If several words share the greatest even length, return the first one.

Nullable text representation

The parameter textInput contains either zero or one string:

An empty array represents a null text value.
A one-element array contains the text to inspect; its string may itself be empty.

Return the literal string "00" when the text is null, empty, contains only whitespace, or contains no even-length word.

Function

longestEvenLengthWord(textInput: String[]) → String

Examples

Example 1

textInput = ["Time to write great code"]return = "Time"

The even-length words are "Time", "to", and "code". The greatest even length is 4; "Time" appears before "code".

Example 2

textInput = ["a  bb\tcccc dddd"]return = "cccc"

Repeated whitespace creates no empty words. Both "cccc" and "dddd" have length 4, so the first one is returned.

Example 3

textInput = []return = "00"

An empty textInput represents a null text value, so the required fallback is returned.

Constraints

0 <= textInput.length <= 1.
When present, 0 <= textInput[0].length <= 2 * 10^5.
The text contains ASCII characters only.
Whitespace delimiters are ASCII space, tab, line feed, carriage return, form feed, and vertical tab characters.
Word length is measured in ASCII characters.