Question

如何实施?

See how is the check digit of a container calculated?

www.un.org/Depts/DGACM/index_spanish.htm 这是一个自我回答的问题。

Answer 1

该数字按ISO 6346:2022计算:

function iso6346CheckDigit(csc) {
  // Remove any non-alphanumeric characters and convert to upper-case.
  csc = csc.toUpperCase().replace(/[^A-Z0-9]+/g,   );

  // Check if length fits requirements.
  if (csc.length < 10 || csc.length > 11)
    return NaN;

  // Calculate check digit.
  var sum = 0;
  for (let i = 0; i < 10; i++) {

    // Map letters to numbers.
    let n = csc.charCodeAt(i);
    n -= n < 58 ? 48 : 55;

    // Numbers 11, 22, 33 are omitted.
    n += (n-1) / 10;

    // Sum of all numbers multiplied by weighting.
    sum += n << i;
  }

  // Modulus of 11, and map 10 to 0.
  return sum % 11 % 10;
}

console.log(iso6346CheckDigit( ZEPU 003725 [5] )); // 5
console.log(iso6346CheckDigit( GVTU 300038 [9] )); // 9
console.log(iso6346CheckDigit( TEXU 307007 [9] )); // 9
console.log(iso6346CheckDigit( GABU 307007 [0] )); // 0
console.log(iso6346CheckDigit( BAAD 10000..... )); // NaN

The above has been published on Git/。

Answer 2

或者,使用 ,和 ,reduce<:

function iso6346CheckDigit(csc) {
  csc = csc.toUpperCase().replace(/[^A-Z0-9]+/g,   );

  // Check if length fits requirements.
  if (csc.length < 10 || csc.length > 11)
    return NaN;

  return Array(10).fill().map((_, i) => csc.charCodeAt(i))
    .map(a => a -= a < 58 ? 48 : 55)
    .map(a => a + (a-1) / 10)
    .map((a, i) => a << i)
    .reduce((a, b) => a + b) % 11 % 10;
}

console.log(iso6346CheckDigit( ZEPU 003725 [5] )); // 5
console.log(iso6346CheckDigit( CEBU 100107 [5] )); // 5
console.log(iso6346CheckDigit( TEXU 307007 [9] )); // 9
console.log(iso6346CheckDigit( ABCD 123456 [0] )); // 0

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