在 JavaScript 中查找文本字符串中出现次数最多的三个单词
问题
我们需要编写一个接受英文字母字符串的JavaScript函数。我们的函数应该返回字符串中出现的前三个最频繁的单词。
示例
以下是代码-
const str = 'Python was developed by Guido van Rossum in the late eighties and early nineties at the National Research Institute for Mathematics and Computer Science in the Netherlands. Python is derived from many other languages, including ABC, Modula-3, C, C++, Algol-68, SmallTalk, and Unix shell and other scripting languages. Python is copyrighted. Python source code is now available under the GNU General Public License (GPL)';
const findTopThree = (str = '') => {
str = str
.replace(/[^\w\s]|_/g, "")
.replace(/\s+/g, " ")
.toLowerCase();
const arr = str.split(' ');
const map = {};
arr.forEach(word => {
map[word] = (map[word] || 0) + 1;
});
const res = Array.from(Object.keys(map), key => [key, map[key]]);
res.sort((a, b) => b[1] - a[1]);
return [res[0][0], res[1][0], res[2][0]];
};
console.log(findTopThree(str));输出结果以下是控制台输出-
["python","the","and"]