JavaScript how to use map function in jquery?

All you need is actually to chain .get() after calling the .map() function, which will return you the array that you have constructed, e.g.:

var $newItem = $items.map(...).get();

The reason why .get() is needed is because .map() generates an array-like object. Since you have started off with a collection of jQuery objects ($newItem), it will return a DOM node list. In order to get the array you intended, you have to call .get() to return a true array (not a DOM node list). A better explanation of why this is needed is available here: map() get() confusion

On a side note, $(item).text() will not be automatically casted into a Number. This means that if the value of the text if 123, it is actually seen as a string. The + operator will concatenate but not perform addition, i.e. $(item).text() + 10 will give you 12310 instead of 133. In order to cast it to a number, simply prepend a unary + operator in front of the variable: +$(item).text() + 10.

Here is a proof-of-concept example of your scenario, with the two modifications mentioned above applied:

$(function() {

  $('.add').click(function() {
    var $items = $('.item li');
    var $newItem = $items.map(function(i, item) {
      console.log($(item).text())
      return +$(item).text() + 10;
    }).get();
    console.log($newItem)
  });

});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button class="add">ADD</button>
<ul class="item">
  <li class="abc">123</li>
  <li class="pp">12</li>
  <li class="abc">78</li>
  <li class="ac">13</li>
</ul>
Answer:1

I think you're looking for $.each() instead of $.map():

$(function() {
  $('.add').click(function() {
    var $items = $('.item li');

    $items.each(function(i, item) {
      $(item).text(parseInt($(item).text()) + 10);
      
      console.log($(item).text())
    });
  });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button class="add">ADD</button>
<ul class="item">
  <li class="abc">123</li>
  <li class="pp">12</li>
  <li class="abc">78</li>
  <li class="ac">13</li>
</ul>
Answer:2

from the lodash documentation: Throttle Creates a throttled function that only invokes func at most once per every wait milliseconds Debounce Creates a debounced function that delays ...

from the lodash documentation: Throttle Creates a throttled function that only invokes func at most once per every wait milliseconds Debounce Creates a debounced function that delays ...

  1. difference between throttle and debounce
  2. difference between throttle body cleaner and carb cleaner
  3. difference between throttle and choke
  4. difference between throttle body and fuel injection
  5. difference between throttle body and carburetor
  6. difference between throttle body and carburetor cleaner
  7. difference between throttle and accelerator
  8. difference between throttle and nozzle
  9. difference between throttle governing and nozzle governing
  10. difference between throttle body and egr valve
  11. difference between throttle and idle cable
  12. difference between throttling and expansion valve
  13. difference between throttle body cleaner and brake cleaner
  14. difference between throttle and mixture
  15. difference between throttle and pedal assist
  16. difference between throttle valve and butterfly valve
  17. difference between throttle and thrust
  18. difference between throttle and strangle
  19. difference between throttle and propeller
  20. difference between throttle body and fuel injector

I have to automate a web-application, which contains a drag and drop area for uploading files from the local file system. My test environment is developed using Python. For the automation tests I have ...

I have to automate a web-application, which contains a drag and drop area for uploading files from the local file system. My test environment is developed using Python. For the automation tests I have ...

  1. python with selenium tutorial
  2. python with selenium examples
  3. python with selenium interview questions
  4. python with selenium jobs
  5. python with selenium syllabus
  6. python with selenium course
  7. python with selenium testing
  8. python with selenium project

I'm in the process of creating a histogram JS script using D3, and it all seems to be working correctly... except for the number of bins. Following is the relevant part of my code: //Define the ...

I'm in the process of creating a histogram JS script using D3, and it all seems to be working correctly... except for the number of bins. Following is the relevant part of my code: //Define the ...

I have this function where many parts of my code call it. function test() { $.ajax({ url : url, type : 'GET', success : { verifyID(); verifyName(); verifyBlah(); } ...

I have this function where many parts of my code call it. function test() { $.ajax({ url : url, type : 'GET', success : { verifyID(); verifyName(); verifyBlah(); } ...

  1. execute function after ajax call is complete
  2. execute function after setstate
  3. execute function after function javascript
  4. execute function after settimeout javascript
  5. execute function after async javascript
  6. execute function after some time javascript
  7. execute function after complete page load
  8. execute function after delay jquery
  9. execute function after for loop javascript
  10. execute function after foreach
  11. execute function after subscribe
  12. execute function after some time jquery
  13. execute function after datatable load
  14. execute function after another function jquery
  15. execute function after timeout javascript
  16. execute function after page load jquery
  17. execute function after map javascript
  18. execute function after render react
  19. execute function after window.location.reload
  20. execute function after 5 seconds jquery