在两个数组中查找匹配值

Question

So I have this value I am getting back from an API that could either be a single item or multiple items.

I map over and return the value I want.

const value = JSONObject.map(data => {return data.value});

console.log(value); // ["value"]

or multiple strings if more than one value present in the map.

Now comes the part where I am confused.

I have another local JSON Object that I want to match against the value from the api.

for(i = 0; i < LocalJSONObject; i++;){
 if(value === LocalJSONObject[i].value){
 console.log("matching values")
 }
}

Only thing is "value" is an array that can contain one single string item or multiple string items.

My understanding is the above if statement is comparing an array to a string which would never be true and thus it never logs.

How do I get it to compare the value in the value array?

Answer 1

for (var lo = 0; lo < LocalJSONObject.length; ++lo) {
  for (var va = 0; va < value.length; ++va) {
    if (value[va] === LocalJSONObject[lo].value) {
      console.log('Matching values:', value[va]);
    }
  }
}

Answer 2

Yes, you are correct in assuming that your statement is comparing an array to a string because the map method returns an array.

To solve it efficiently, you can use the Array.prototype.includes() method to get the result.

for(i = 0; i < LocalJSONObject; i++;){
 if(value.includes(LocalJSONObject[i].value)){
   console.log("matching values")
 }
}