How should I practice Swap Adjacent Character Pairs?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Hartford Financial Services onsite interview problems in FastPrep.

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Swap Adjacent Character Pairs

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Problem statement

Given a string text, swap the two characters in every consecutive, nonoverlapping pair, starting from the beginning, and return the resulting string.

The pairs use zero-based positions (0, 1), (2, 3), and so on. If the length is odd, leave the final unpaired character unchanged. Preserve the order of the pairs.

For example, abcd becomes badc.

Function

swapAdjacentPairs(text: String) → String

Examples

Example 1

text = "abcd"return = "badc"

Swap a with b, then c with d. This input/output pair appears in the report.

Example 2

text = "abcde"return = "badce"

The pairs are swapped, while the final e has no partner and stays unchanged.

Example 3

text = "a"return = "a"

There is no complete pair, so the string stays unchanged.

Constraints

1 <= text.length <= 10^5.
text contains only lowercase English letters a through z.