匹配 javascript 数组中的值

Question

before anything i've been checking this post : How can I find matching values in two arrays? But it did not help me. I don't really get it. So maybe if I explain my problem here someone can help me to solve it.

I have a school project (I am supposed to match user regarding their location, tags , popularity score etc. Before using an algorithm for the two location I want a first non precise sort. So basically I want to compare two value like 'Paris' and 'Paris')

My search function returns me an [] with two {} inside, so there are two people that match regarding my first search values (gender)

I'm using Node.js, my database is MySQL and my function are using callback and promises so far.

So This is my first object (it contains my searcher's informations)

[ RowDataPacket {
id: 34,
username: 'natedogg',
latitude: 48.8835,
longitude: 2.3219,
country: 'France',
city: 'Paris',
zipcode: 75017 } ]

This is the second one (it contains 2 users)

[ RowDataPacket {
id: 33,
username: 'pablito',
latitude: 48.8921,
longitude: 2.31922,
country: 'France',
city: 'Paris',
zipcode: 75017 },
RowDataPacket {
id: 35,
username: 'tupac',
latitude: 48.8534,
longitude: 2.3488,
country: 'France',
city: 'levallois',
zipcode: 92300 } ]

No that I have this data how can I check if my searcher's location is == my otherUsersLocation (even if they are more than 1 location) Thank for your help !

Answer 1

It sounds like you basically want to compare your first object (your search data), against your objects in the second array (your user data). You don't necessarily directly need to compare the two arrays because you have more complicated data than things like strings or numbers.

To compare the objects in plain JavaScript I would do something like this:

// loop through each object in user array
for (object in secondArray) {

    // loop through each property in the user object
    for (property in object) {

        // compare the property of user object with corresponding search object property
        if (property === firstArray[0][property]) {
            // do something
        }
    }
}

Answer 2

I worked up some code for you, that works and you should be able to apply it to your situation. Basically, we are just looping through the objects we want to search and looking at the "city" property. I renamed some of the variables to make what's going on clearer.

var data = {
    id: 34,
    username: 'natedogg',
    latitude: 48.8835,
    longitude: 2.3219,
    country: 'France',
    city: 'Paris',
    zipcode: 75017 
};

var searchable = [{
    id: 33,
    username: 'pablito',
    latitude: 48.8921,
    longitude: 2.31922,
    country: 'France',
    city: 'Paris',
    zipcode: 75017 },
    {
    id: 35,
    username: 'tupac',
    latitude: 48.8534,
    longitude: 2.3488,
    country: 'France',
    city: 'levallois',
    zipcode: 92300 
}];

// this array is just to save obj when we have a match
var found =[];
// loop through each element in our searchable array
for(var i=0;i<searchable.length;++i){
    if(data["city"] == searchable[i]["city"]){
       // did we find it? push it onto the found array
       console.log("found: " + searchable[i]["city"]);
       found.push(searchable[i]["username"]);}
}
// look to see if we got what we wanted
console.log(found);

You can follow this same procedure to match anything in the data.

Answer 3

This is how I managed to find the matching values in my arrays if (SecondArray){ // console.log(SecondArray.length); SecondArray.forEach(function(element) { if (firstArray[0].city === element.city) { console.log("element); } }) } if (SecondArray){ // console.log(SecondArray.length); SecondArray.forEach(function(element) { if (firstArray[0].city === element.city) { console.log("element); } }) }