290. 单词规律

题

思路

"abba","dog cat cat dog" => true
使用hashmap去比对，判断是否有不一致的value
"abba","dog dog dog dog" => false
再生成反向的hashmap去判断是否一致

代码

function wordPattern(pattern: string, s: string): boolean {
    const words = s.split(" ");
    const len = pattern.length;
    if(words.length !== len) return false;

    const map = new Map();
    const rMap = new Map();
    
    for(let i = 0; i < len; i++) {
        if(map.has(pattern[i]) && map.get(pattern[i]) !== words[i]) return false;
        map.set(pattern[i], words[i]);
        rMap.set(words[i], pattern[i]);
    }
    return map.size === rMap.size;
};