拆分字符串的第一句话

Question

我有一个字符串，它是我试图使用split方法仅返回该段落的第一句话的段落。我的目标是分别添加第一句话和段落的其余部分。我可以返回第一句话，但我也希望第一句话不再出现在原始data中。在这种情况下，即使我成功地拆分了第一句话，它仍然留在了data中，我怎么能把这两句话分开呢？

例如：

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 const data = "The amount spent on gasoline continues to be a large expense to many individuals. The average amount spent on gasoline per year is $2000. This number can easily change as the price of gasoline is rapidly changing."

let firstSentence = data.split('\.', 1)[0];

console.log(firstSentence)

console.log(data)

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我的预期结果是：

first sentence: "The amount spent on gasoline continues to be a large expense to many individuals."

data: "The average amount spent on gasoline per year is $2000. This number can easily change as the price of gasoline is rapidly changing.

Answer 1

字符串是immutable。您在data中对字符串所做的任何方法或任何操作都不会修改字符串-像.split()这样的函数只返回新数据，它们不会改变原始数据。

.split()返回一个包含每个部分的数组。您已经使用第二个参数将其限制为一次拆分，因此第一个参数之后的其余句子不会返回。相反，您可以获得所有的拆分，并在第一次拆分后重新加入其中的拆分。

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 const data = "The amount spent on gasoline continues to be a large expense to many individuals. The average amount spent on gasoline per year is $2000. This number can easily change as the price of gasoline is rapidly changing."

let sentences = data.split('\.');
let firstSentence = sentences.shift(); //remove and return first element
let rest = sentences.join('.').trim(); //undo split and trim the space

console.log(firstSentence)
console.log(rest)

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Answer 2

您需要将数组的第二个元素赋给data，以便data包含该值。split()实际上并不修改数组。

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let data = "The amount spent on gasoline continues to be a large expense to many individuals. The average amount spent on gasoline per year is $2000. This number can easily change as the price of gasoline is rapidly changing."; // Original data

const arr = data.split(/\./); // Split data

let firstSentence = arr[0]; // Set firstSentence to the first item of array

arr.shift(); // Remove first item

data = arr.join('. '); // Set data to the rest of the array

console.log(firstSentence)

console.log(data)

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Answer 3

试试这个。

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let data = "The amount spent on gasoline continues to be a large expense to many individuals. The average amount spent on gasoline per year is $2000. This number can easily change as the price of gasoline is rapidly changing."

let firstSentence = data.split('\.', 1)[0];

data = data.replace(firstSentence + '. ', '');
console.log(firstSentence)

console.log(data)

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