CODEWITHSUNDEEP
node.jsarraysloops
Mazino
Mazino

Reputation: 356

Comparing each element of two Arrays - NodeJS

Objective

I want to compare each element of two arrays, when an element does not match in both of them, it gets pushed to another array.

Both array are of indefinite size.

Code So Far

Example:
//namelist will always have the values present, userlist will check if it has the elements in namelist, otherwise send to another array.

namelist = ['user1','user2','user3','user4','user5']

userlist = ['user4','user1','user3']  //'user2' and 'user5' are not present


//Does not work

let arr1 = [];

let arr2 = [];

for(let i = 0; i < namelist.length && userlist.length; i++){

    if(namelist[i] == userlist[i]){

        arr1  = userlist[i]
    } else {

        arr2  = userlist[i]
    }
}

console.log(arr2);

Upvotes: 0

Views: 44

Answers (1)

ambianBeing
ambianBeing

Reputation: 3529

Iterate on namelist and check item from this array exists in userlist using Array.includes. If false add to result array.

    const namelist = ['user1','user2','user3','user4','user5'];
    const userlist = ['user4','user1','user3'];

    let result = [];
    namelist.forEach(name => {
    if(!userlist.includes(name)){
    result.push(name);
    }
    });
    
    console.info('result::', result);

Upvotes: 1

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