从搜索文本中派生关键字

Question

我正在尝试生成关键字来搜索和显示数据库中的一些内容。我给出了一个示例搜索文本和我想从关键字中派生的关键字。 有人可以指导我如何实现从动态搜索字符串中获取关键字的逻辑，如下所示？

var searchText='My name is John santose mayer'

var Keywords={ 

  1: 'My name is John santose mayer',

  2: 'My name is johns santose',

  3: 'My name is John',

  4: 'My name is',

  5: 'My name'

  6: 'My'

}

Answer 1

const keywords = searchText.split(' ');
const phrases = [];
for(let length = keywords.length; length > 0; length--) {
  phrases.push(keywords.slice(0, length).join(' '));
}

Answer 2

像这样使用reduce ？

 var searchText='My name is John santose mayer'; let keywords = searchText.split(' ').reduce((prev, next) => { const concatWith = prev[prev.length - 1]? prev[prev.length - 1] + ' ': '' return [...prev, concatWith + next] }, []).reverse() console.log(keywords)

Answer 3

split ， map ， slice和reduce的简单组合应该可以解决问题。

const foo = "My name is John santose mayer"
    .split(" ")
    .map<string>((_, i, arr) => arr.slice(0, arr.length - i).join(" "))
    // [
    //     "My name is John santose mayer",
    //     "My name is John santose",
    //     "My name is John",
    //     "My name is",
    //     "My name",
    //     "My"
    //   ]
    .reduce<{ [key: number]: string }>((acc, curr, i) => {
        acc[i + 1] = curr;
        return acc;
    }, {});

console.log(foo);
// {
//     "1": "My name is John santose mayer",
//     "2": "My name is John santose",
//     "3": "My name is John",
//     "4": "My name is",
//     "5": "My name",
//     "6": "My"
// }