Cease the Vue filter / JavaScript upon meeting the condition

New to Javascript and Vue. Trying to create a filter that formats single, double, or triple digit numbers. For a 1 digit number, I want it to be displayed as '#00X', for a 2 digit number as '#0XX', and for a 3 digit number as '#XXX'. This is what I have so far:

//Vue Filter

Vue.filter('number_filter', function (value){
  if(value.toString().length === 1){
    return '#00' + value;
  } else if(value.toString().length === 2){
    return '#0' + value;
  } else {
    return '#' + value;
  }
});

The current issue is that the filter only returns '#X' when encountering a single digit number. How can I modify it to work correctly?

javascriptvue.jslogic

Answer №1

You can simplify your code by utilizing the String.prototype.padStart() method instead of using an if/else statement:

Vue.filter('number_filter', function (value){
    return '#' + value.toString().padStart(3, '0');
});

If you stick with your original approach, make sure to convert the Number type value into a string before checking its length property. Here's how you can modify it:

Vue.filter('number_filter', function (value){
  value = value.toString();
  if(value.length === 1) {
    return '#00' + value;
  } else if(value.length === 2) {
    return '#0'+ value;
  } else {
    return '#' + value;
  }
});

Answer №2

Here is a way to streamline the code:

Vue.filter('number_filter', function (value){

  value = value.toString()
 
  if(value.length === 1){
    return '#00' + value;
  }
  if(value.length === 2){
    return '#0'+ value;
  }
    return '#' + value;
  
});

Answer №3

Check out this informative post on finding the number of digits.

In relation to your query, if there are no constraints preventing users from entering a number with more than 3 digits, your output may look like "#3051". In that case, you'll need an additional else-if statement to validate the number of digits being exactly 3.

Answer №4

As an illustration:

 Vue.filter('number_filter', function (value){
     return "#"+"0".repeat(3 - value.length)+value.toString();
 });

Answer №5

For your specific need, you can utilize the padStart method within the String function. This method will insert zeros for two-digit numbers while keeping the rest unchanged.

Vue.filter('number_filter', function (value){
 return '#' + value.padStart(3, 0)
});

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