javascript - 如何将字符串分成小于定义长度的部分

Question

我有一个字符串 ( this is the very very very very long string)，我想要将它分成少于 25 个字符的部分，并且这些部分必须有完整的单词，例如： this is the very very 而very very long string不是this is the very very verand y very long string。

标签： javascript

Answer 1

连接和收集这些部分并确实限制每个部分的连接长度的reduce基于方法可以实现类似于下一个提供的示例代码......

function concatAndCollectPartialsOfLimitedLength(collector, str) {
  const { limit = 24, list } = collector;

  const lastIdx = list.length - 1;
  const partial = list[lastIdx];

  if (partial && (partial.length + str.length + 1 <= limit)) {
    // concatenate if partial exists and if the length of its
    // next concatenated version does not exceed the limit ...

    list[lastIdx] = [partial, str].join(' ');
  } else {
    // ... otherwise provide and collect the base
    // for the following concatenation step(s).

    list.push(str);
  }
  return collector;
}

console.log(
  'concatenated partial length is limited to 24 chars ...',
  "this is the very very very very long string and some more of it and even more"
    .trim()
    .split(/\s+/)
    .reduce(concatAndCollectPartialsOfLimitedLength, { list: [] })
    .list
);
console.log(
  'concatenated partial length is limited to 13 chars ...',
  "this is the very very very very long string and some more of it and even more"
    .trim()
    .split(/\s+/)
    .reduce(
      concatAndCollectPartialsOfLimitedLength,
      { limit: 13, list: [] }
    )
    .list
);
console.log(
  'concatenated partial length is limited to 31 chars ...',
  "this is the very very very very long string and some more of it and even more"
    .trim()
    .split(/\s+/)
    .reduce(
      concatAndCollectPartialsOfLimitedLength,
      { limit: 31, list: [] }
    )
    .list
);

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