Tips for sorting postcodes in the United Kingdom

Question

Tips for sorting postcodes in the United Kingdom

I am currently working on a project in Vue where I need to match the initial part of a UK postcode with the data stored in a JSON file.

So far, I have been successful in matching postcodes that begin with 2 letters. However, some UK postcodes may only start with one letter, causing my current method to fail.

If you want to see the full code, you can visit this link: https://codesandbox.io/s/48ywww0zk4

Here is a snippet from the JSON file:

{
  "id": 1,
  "postcode": "AL",
  "name": "St. Albans",
  "zone": 3
},
{
  "id": 2,
  "postcode": "B",
  "name": "Birmingham",
  "zone": 2
},
{
  "id": 3,
  "postcode": "BA",
  "name": "Bath",
  "zone": 5
}

let postcodeZones = this.postcodeDetails.filter(
  pc => pc.postcode
          .toLowerCase()
          .slice(0, 2)
          .indexOf(this.selectPostcode.toLowerCase().slice(0, 2)) > -1
);

I could use some assistance in correctly identifying 'B' for a postcode like B94 5RD and 'BA' for BA33HT. Can anyone help me with this?

javascript vue.js filter postal-code

Answer 1

Answer №1

If you need to extract the alphabetical letters at the beginning of a string, you can achieve this by using a regular expression.

function getLettersBeforeNumbers( input ) {
  return input.match( /^[a-zA-Z]*/ )[0];
}

let result1 = getLettersBeforeNumbers( 'B94 5RD' );
let result2= getLettersBeforeNumbers( 'bA33HT' );
let result3 = getLettersBeforeNumbers( '33bA33HT' );

console.log( result1, result2, result3);

/** Breakdown of the Regular Expression

  / ^[a-zA-Z]* /
  
  ^ = anchor indicating the start of the string
  [  ... ] = specify characters to match
  a-z = all lowercase alphabet characters
  A-Z = all uppercase alphabet characters
  * = zero or more occurrences
**/

Note that you can simply utilize .match( /^[a-zA-Z]*/ )[0]; in your code for this purpose.

Answer 2

If you need to extract the alphabetical letters at the beginning of a string, you can achieve this by using a regular expression.

function getLettersBeforeNumbers( input ) {
  return input.match( /^[a-zA-Z]*/ )[0];
}

let result1 = getLettersBeforeNumbers( 'B94 5RD' );
let result2= getLettersBeforeNumbers( 'bA33HT' );
let result3 = getLettersBeforeNumbers( '33bA33HT' );

console.log( result1, result2, result3);

/** Breakdown of the Regular Expression

  / ^[a-zA-Z]* /
  
  ^ = anchor indicating the start of the string
  [  ... ] = specify characters to match
  a-z = all lowercase alphabet characters
  A-Z = all uppercase alphabet characters
  * = zero or more occurrences
**/

Note that you can simply utilize .match( /^[a-zA-Z]*/ )[0]; in your code for this purpose.

Tips for sorting postcodes in the United Kingdom

Answer №1

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