forEach loop: Sum multiple values in the same Variable

Question

I'm using find to get values on my variable, but when this variable return multiples values, my condition can't read them.

What I need is sum this variable values, returning just one number.

Code:

mail.forEach(function(m) {

    var nresult = $("#dat").contents()
        .find("td:contains('" + m.hexEncode() + "')" )
        .length;

    return nresult;

});

I need to keep this forEach function - is the only way to keep my external data working, so, this will return, in that case, this values: 0,0,1,1,0, and I need just 2 on return.

How can I do that? Thanks!

I think it is. I mean, if I use some script deleting the past value and adding a new one, just one value return. But when I use something like append, I get all values returning. — Zeca Novaes
– Zeca Novaes, Commented Mar 4, 2016 at 2:00

Suicideboy · Accepted Answer · 2016-03-04 02:43:10Z

1

EDIT (after chat) : You can modify your return statement to do something like that :

var res = mail.map(function(m) { 

    var nresult = $("#dat").contents() 
    .find("td:contains('" + m.hexEncode() + "')" ) 
    .length; 
    return nresult;

}).reduce(function(a,b){ return a+b });

So the reduce function will execute a+b on the array returned by map().

You can then use your variable res as you want.

edited Mar 4, 2016 at 2:43

answered Mar 4, 2016 at 2:06

Suicideboy

1448 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Zeca Novaes Over a year ago

Log - Cannot read property 'reduce'. Thanks, Tomisol, for your answer. You know how can I change that?

Suicideboy Over a year ago

Which one gives you this error ? The return statement with nresult ?

Zeca Novaes Over a year ago

No, the console log of entire page when I run the script

Zeca Novaes Over a year ago

Oh, sorry, the second. The first return a null value

Suicideboy Over a year ago

Which call gives you this 0,0,1,1,0 in your code ?

|

Collectives™ on Stack Overflow

forEach loop: Sum multiple values in the same Variable

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related