Breaking News: Grepper is joining You.com. Read the official announcement!

compare two arrays and remove not matched objects

Vivacious Vendace answered on January 30, 2021 Popularity 6/10 Helpfulness 6/10

answer compare two arrays and remove not matched objects

compare two arrays and remove not matched objects

Comment

If you're looping over array1 with i = 0, len = array1.length; i < len; i++,
but within the loop you remove an entry from array1 what do you think happens
on the next loop?

You also appear to be removing things that are found, but your question say
you want to remove ones that aren't. In the below, in light of your comment,
I'm removing things that aren't found.

In that case, use a while loop. I'd also use Array#some (ES5+) or Array#find (ES2015+)
rather than doing an inner loop:

var i = 0;
var entry1;
while (i < array1.length) {
    entry1 = array1[i];
    if (array2.some(function(entry2) { return entry1.Id === entry2.Student.Id; })) {
        // Found, progress to next
        ++i;
    } else {
        // Not found, remove
        array1.splice(i, 1);
    }
}
Or if it's okay to create a new array, use filter:

array1 = array1.filter(function(entry1) {
    return array2.some(function(entry2) { return entry1.Id === entry2.Student.Id; }));
});

Popularity 6/10 Helpfulness 6/10 Language whatever

Source: Grepper

Tags: arrays compare whatever

Link to this answer
Share Copy Link

Contributed on Jan 30 2021

Vivacious Vendace

0 Answers Avg Quality 2/10

Continue with Google

By continuing, I agree that I have read and agree to Greppers's Terms of Service and Privacy Policy.

compare two arrays and remove not matched objects

Contents

More Related Answers

compare two arrays and remove not matched objects

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.