Remove specific numbers from array

Question

I am trying to remove specific numbers from each array, but no success. I have googled it, but I nothing found similar. First I created an array by commas, and then I wanted to remove 021 and dash from array[i] (each value), just the first three characters.

$('.numbers').each(function() {
  if ($(this).text().indexOf(',') != -1) {
    var seprate = $(this).text();
    var array = seprate.split(',');
    $.each(array, function(i, el) {

      if (array[i].indexOf("021") != -1) {
      array[i].substr(0,2).replace("021", "")
      }

      $('.phonearray').append(array[i]);
    });
  }
});

.phonearray {
background: lightgreen;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="numbers">
  02188776021 , 09123074859 , 021-45676543 , 021 -55446021
</div>

<div class="phonearray">

</div>

And I used substr to remove the first three characters, but it not working.

.replace() doesn't modify the original string, you have to assign the result to something. — Barmar
– Barmar, Commented Jan 1, 2017 at 8:35

Peter Mortensen · Accepted Answer · 2018-01-04 11:23:56Z

2

replace() doesn't modify the original string (JavaScript strings are immutable). You need to assign the result back to the array.

You can do what you want with a regular expression replacement. The regexp ^021\s*-? matches 021 at the beginning, possibly followed by whitespace and a - character.

I also used .trim() to remove the spaces around the comma.

$('.numbers').each(function() {
  if ($(this).text().indexOf(',') != -1) {
    var seprate = $(this).text();
    var array = seprate.split(',');
    $.each(array, function(i, el) {
      var val = el.trim().replace(/^021\s*-?/, '');
      $('.phonearray').append(val);
    });
  }
});

.phonearray {
  background: lightgreen;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="numbers">
  02188776021 , 09123074859 , 021-45676543 , 021 -55446021
</div>

<div class="phonearray">

</div>

edited Jan 4, 2018 at 11:23

Peter Mortensen

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answered Jan 1, 2017 at 8:41

Barmar

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Comments

amd · Accepted Answer · 2017-01-01 08:55:25Z

Let's define the problem first: You have a string that contains phone numbers separated by commas, and you have to remove the prefix if found in each number

First thought:

function removePrefixes(input /* string */) {
  return input.split(',')
   .map(x => x.trim())
   .map(x => x.replace(/\b021\s*/, ''))
   .join(', ')
}

Replace the original text:

$('.numbers').text((i, text) => removePrefixes(text));

Examples:

removePrefixes("02188776021 , 09123074859 , 021-45676543 , 021 -55446021") 
// returns "88776021, 09123074859, -45676543, -55446021"

Explanation:

split by commas, converted to an array
remove the surrounding spaces (trim)
replace the numbers starting by 021, the \b means word boundary, \s* any spaces after it
join the collection, back to string

From here do whatever you want.

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