Guide to Creating a Number Filter Pipe in Angular

Question

Guide to Creating a Number Filter Pipe in Angular

Recently, I've been working on creating a filter pipe that can filter by numbers. This is because I want to use it to filter job postings based on salary. Although I successfully created a filter for string characters, I'm unsure about how to handle filtering by numbers as I am still new to this concept.

Check out my filter pipe code below:

import { Pipe, PipeTransform } from '@angular/core';
import { Jobs } from '../interfaces/jobs.interface';

@Pipe({
  name: 'filterSalary'
})
export class FilterSalaryPipe implements PipeTransform {

  transform(value: Array<Jobs>, arg: any): any {
    const resultPosts = [];
    for (const jobs of value) {
      if (jobs.salary.indexOf(arg) > -1) {
        resultPosts.push(jobs);
      };
    };
    return resultPosts;
  }
}

I have a question regarding the usage of 'jobs.salary'. Can anyone guide me on which specific method I should be using in this context?

angular typescript angular14

Answer 1

Answer №1

To determine if a string is a number, you can use the typeof() function.
For example:

 const searchString = 11;
 if(typeof(searchString) === 'number'){
   console.log(searchString);
 }

In your specific case:

import { Pipe, PipeTransform } from '@angular/core';
import { Jobs } from '../interfaces/jobs.interface';

@Pipe({
  name: 'filterSalary'
})
export class FilterSalaryPipe implements PipeTransform {

  transform(value: Array<Jobs>, arg: any): any {
    const resultPosts = [];
    for (const jobs of value) {
      if (typeof(jobs.salary) === 'number') {
       resultPosts.push(jobs.salary.toString().toLowerCase().includes(arg));
      };
    };
    return resultPosts;
  }
}

Answer 2

To determine if a string is a number, you can use the typeof() function.
For example:

 const searchString = 11;
 if(typeof(searchString) === 'number'){
   console.log(searchString);
 }

In your specific case:

import { Pipe, PipeTransform } from '@angular/core';
import { Jobs } from '../interfaces/jobs.interface';

@Pipe({
  name: 'filterSalary'
})
export class FilterSalaryPipe implements PipeTransform {

  transform(value: Array<Jobs>, arg: any): any {
    const resultPosts = [];
    for (const jobs of value) {
      if (typeof(jobs.salary) === 'number') {
       resultPosts.push(jobs.salary.toString().toLowerCase().includes(arg));
      };
    };
    return resultPosts;
  }
}

Guide to Creating a Number Filter Pipe in Angular

Check out my filter pipe code below:

Answer №1

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