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Javascript频率计数器算法

转载 作者:塔克拉玛干 更新时间:2023-11-03 06:35:42 24 4
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function solution(first, second){
var frequencyCounter1 = {};
var frequencyCounter2 = {};
for(var val of first){
frequencyCounter1[val] = (frequencyCounter1[val] || 0) +1
}
console.log(frequencyCounter1);
}

我不明白这个语法是什么意思frequencyCounter1[val] = (frequencyCounter1[val] || 0) +1

你能帮我解释一下这个意思吗?

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