Typescript conditional filtering: unlocking the power of targeted searches

I'm attempting to dynamically filter an array based on user choices from multiple drop down menus. I want the filtering process to only consider the selected values from the drop downs and ignore any dropdown where a selection was not made. Is there a more efficient way to achieve this without resorting to a series of if/else statements?

This is my current approach, but I'm exploring possibilities for streamlining the process:

filterOptions() {
      if (this.name != undefined && this.age != undefined) {
        this.filteredOptions = this.Options
          .filter(x => x.name == this.name)
          .filter(x => x.age == this.age);
      } else if (this.name == undefined && this.age != undefined) {
        this.filteredOptions = this.Options
          .filter(x => x.age == this.age);
      } else if (this.name != undefined && this.age == undefined) {
        this.filteredOptions = this.Options
          .filter(x => x.flcaLoan == this.name);
      } else {
        this.filteredOptions = this.Options;
      }
  }

Answer №1

To simplify, you can consolidate the filtering into a single condition like this:

this.Options.filter(x => {
  if (this.name && this.name != x.name) {
    return false; // remove if name is set and does not match
  } else if (this.age && this.age != x.age) {
    return false; // remove if age is set and does not match
  }

  return true; // keep
}

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