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

why array.map returns undefined

Nasty Narwhal answered on December 14, 2021 Popularity 10/10 Helpfulness 4/10

answer why array.map returns undefined

related why array.map returns undefined

why array.map returns undefined

Comment

let test = [ {name:'test',lastname:'kumar',age:30},
             {name:'test',lastname:'kumar',age:30},
             {name:'test3',lastname:'kumar',age:47},
             {name:'test',lastname:'kumar',age:28},
             {name:'test4',lastname:'kumar',age:30},
             {name:'test',lastname:'kumar',age:29}]

let result1 = test.map(element => 
              { 
                 if (element.age === 30) 
                 {
                    return element.lastname;
                 }
              }).filter(notUndefined => notUndefined !== undefined);

output : ['kumar','kumar','kumar']



// same output but simple code for above snippet
let result1 = test.filter(element => 
              { 
                 if (element.age === 30) 
                 {
                    return element;
                 }
              }).map(({lastname})=>lastname)
console.log(result1)
output : ['kumar','kumar','kumar']

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript undefined

Link to this answer
Share Copy Link

Contributed on Dec 14 2021

Nasty Narwhal

0 Answers Avg Quality 2/10

Closely Related Answers

why array.map returns undefined

Comment

let test = [ {name:'test',lastname:'kumar',age:30},
             {name:'test',lastname:'kumar',age:30},
             {name:'test3',lastname:'kumar',age:47},
             {name:'test',lastname:'kumar',age:28},
             {name:'test4',lastname:'kumar',age:30},
             {name:'test',lastname:'kumar',age:29}]

let result1 = test.filter(element => 
              { 
                 if (element.age === 30) 
                 {
                    return element;
                 }
              }).map(({lastname})=>lastname)
console.log(result1);
output : ['kumar','kumar','kumar']

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

Link to this answer
Share Copy Link

Contributed on Dec 14 2021

Nasty Narwhal

0 Answers Avg Quality 2/10

why array.map returns undefined

Contents

More Related Answers

why array.map returns undefined

Closely Related Answers

why array.map returns undefined

Grepper

Documentation

Social

Legal

Contact

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