INNER CODE UNIT · TypeScript

secureRandomIndex

aws-devtools-labs/aws-blocks · native/swift/Demo/typescript-demo/src/index.ts:311

function secureRandomIndex(maxExclusive: number): number {
  if (!Number.isInteger(maxExclusive) || maxExclusive <= 0 || maxExclusive > 256) {
    throw new Error('maxExclusive must be an integer between 1 and 256');
  }
  const limit = 256 - (256 % maxExclusive);
  const bytes = new Uint8Array(1);
  while (true) {
    crypto.getRandomValues(bytes);
    const value = bytes[0];
    if (value < limit) {
      return value % maxExclusive;
    }
  }
}

const myColor = COLORS[secureRandomIndex(COLORS.length)];

const realtimeArea = document.getElementById('realtime-area')!;

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