How should I practice Alternate String Ends?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Capital One online assessment problems in FastPrep.

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Problem · String

Alternate String Ends

Learn this problem

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Problem statement

Given a string s, return a new string formed by reading characters from alternating ends.

Use the characters in this order:

Take the first character.
Take the last character.
Take the second character.
Take the second-to-last character.
Continue moving inward until every character has been used exactly once.

Equivalently, for a string of length n, visit indices 0, n - 1, 1, n - 2, and so on.

Function

alternateStringEnds(s: String) → String

Examples

Example 1

s = "abcde"return = "aebdc"

The characters are taken from indices 0, 4, 1, 3, and 2, producing aebdc.

Example 2

s = "abcdef"return = "afbecd"

The characters are taken from indices 0, 5, 1, 4, 2, and 3, producing afbecd.

Example 3

s = "x"return = "x"

A one-character string has the same character at the only position, so the result is x.