Write a function formatBytes(bytes) that converts a non-negative integer number of bytes into a human-readable string using units B, KB, MB, or GB (base 1024). Values with units larger than B should be rounded to two decimal places, omitting trailing zeros if whole (e.g., formatBytes(1536) returns '1.5 KB', formatBytes(1048576) returns '1 MB', and formatBytes(500) returns '500 B').
function formatBytes(bytes) {
// Your code here
}
Rules:
- Use 1024 as the byte conversion threshold.
- Do not display trailing zeros after decimal places (e.g. ‘1.5 KB’, not ‘1.50 KB’).
- Return ‘0 B’ when the input is 0.
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