如何知道一个字符串是否在Javascript中至少包含一个数组元素答案

【问题标题】：How to know if a string includes at least one element of array in Javascript如何知道一个字符串是否在Javascript中至少包含一个数组元素
【发布时间】：2020-02-05 03:11:11
【问题描述】：

let theString = 'include all the information someone would need to answer your question'

let theString2 = 'include some the information someone would need to answer your question'

let theString3 = 'the information someone would need to answer your question'

let theArray = ['all', 'some', 'x', 'y', 'etc' ]

theString 为真，因为存在“全部”， theString2 为真，因为有“一些”， theString3 false 因为没有“全部”或“某些”

【问题讨论】：

但是在theString3 中有是 some -- 为什么它会返回false？
您能否提供更多关于您如何定义“包含”的详细信息？正如上面的评论所提到的，在“某人”中有技术上的“一些”

标签： javascript arrays logic

【解决方案1】：

const theStringIsGood = theString.split(' ').some(word => theArray.includes(word))

此代码将一个句子拆分为每个单词，并检查是否有任何单词与匹配集 theArray 匹配。

【讨论】：

【解决方案2】：

您可以使用 string.includes() 方法。但在这种情况下，theString3 仍然会返回 true，因为 some 在某些东西中。您可以创建一个辅助函数来查看字符串是否在数组中：

function findString(arr, str) {
    let flag = false;
    let strArr = str.split(' ');
    arr.forEach(function(s) {
        strArr.forEach(function(s2) {
            if(s === s2) {
                flag = true;
            }
        });
    });
    return flag;
};

现在您可以将数组和其中一个字符串传递给函数并对其进行测试。

【讨论】：

【解决方案3】：

你可以用正则表达式简单地做到这一点：

function ArrayInText(str, words) {
    let regex = new RegExp("\\b(" + words.join('|') + ")\\b", "g");
    return regex.test(str);
}

在正则表达式中 \b 是单词边界

请注意，如果您自己拆分所有字符串并逐个检查，则会占用大量内存，因为这是一个贪婪的解决方案。我使用 javascript 原生函数提供。

sn-p：

let theString = 'include all the information someone would need to answer your question'

let theString2 = 'include some the information someone would need to answer your question'

let theString3 = 'the information someone would need to answer your question'

let theArray = ['all', 'some', 'x', 'y', 'etc']

function ArrayInText(str, words) {
    let regex = new RegExp("\\b(" + words.join('|') + ")\\b", "g");
    return regex.test(str);
}

console.log(ArrayInText(theString, theArray));
console.log(ArrayInText(theString2, theArray));
console.log(ArrayInText(theString3, theArray));

祝你好运:)

【讨论】：

【解决方案4】：

1) isIncludeWord -- 使用 split 和 includes 方法查找完全匹配的单词。
2) isInclude -- 使用some 和includes 查找匹配包含。

let theString =
  "include all the information someone would need to answer your question";
let theString2 =
  "include some the information someone would need to answer your question";
let theString3 = "the information someone would need to answer your question";
let theArray = ["all", "some", "x", "y", "etc"];

const isIncludeWord = (str, arr) =>
  str.split(" ").reduce((include, word) => include || arr.includes(word), false);

const isInclude = (str, arr) => arr.some(item => str.includes(item));

console.log(isIncludeWord(theString, theArray));
console.log(isIncludeWord(theString2, theArray));
console.log(isIncludeWord(theString3, theArray));

console.log(isInclude(theString, theArray));
console.log(isInclude(theString2, theArray));
console.log(isInclude(theString3, theArray));

【讨论】：