Manipulate Array with foreach loop and a callback

Question

I was manipulating an array with a for loop. How can I do this with a forEach loop and a function? I tried this, but I'm getting an undefined in the output.

var pets = ['cat', 'dog', 'rat'];

pets = pets.forEach( function plural(value, index, array){
    value = value + 's';
    return value;
})


/*for ( i = 0; i < pets.length; i++) {
    pets[i] = pets[i] + 's';
}
*/

console.log(pets);

SetupX · Accepted Answer · 2014-11-05 15:46:41Z

1

pets.forEach( function plural(value, index){
    pets[index]  = value + 's';
})

answered Nov 5, 2014 at 15:46

SetupX

4132 gold badges5 silver badges13 bronze badges

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

Comments

Oleksandr T. · Accepted Answer · 2014-11-05 15:45:00Z

1

pets = pets.map( function plural(value, index, array){
    return value + 's';
})

answered Nov 5, 2014 at 15:45

Oleksandr T.

77.6k17 gold badges177 silver badges145 bronze badges

Collectives™ on Stack Overflow

Manipulate Array with foreach loop and a callback

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related