Human-readable bytes in JavaScript

Turns a byte count into something a person can read.

function formatBytes(bytes) {
  if (bytes === 0) return "0 B";
  const units = ["B", "KB", "MB", "GB", "TB"];
  const i = Math.floor(Math.log(bytes) / Math.log(1024));
  const value = bytes / 1024 ** i;
  return `${value.toFixed(value < 10 && i > 0 ? 1 : 0)} ${units[i]}`;
}

Keywords and builtins used here

• Math
• const
• function
• if
• return

The run, in numbers

Lines

7

Characters to type

264

Tokens

90

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 64 seconds.

Type this snippet

Step 4 of 5 in Text, step 9 of 43 in Language basics.

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