What is the syntax for utilizing a for loop with an array of strings and a filter in JavaScript?

Given an array of strings as a parameter, I am trying to use the filter method for each string in the array and return matched results.

  get moviesByCity() {
    return (id: string[]): MovieI[] | undefined => {
      console.log(id);
      for (let i = 0; i <= id.length; i++) {
        console.log(id.length);
        console.log(id[i]);
        console.log(i);
        return this.movies.filter((movie) => movie.city === id[i]);
      }
    };
  }

The issue I'm facing is that 'i' doesn't seem to iterate and stays at '0'. Can anyone spot where I might have made a mistake?

https://i.sstatic.net/2p65d.png

I checked the console.logs in the same order: 'id.length', 'id[i]', and 'i'

Answer №1

Uncertain of your intentions, but I will provide an estimate.

You have made structural errors by misusing functions.

Consult the documentation for correct usage of functions like map, filter, and some.

const moviesByCity = (ids: string[]): MovieI[] | undefined => {
  console.log(ids);
  return ids.map((id, index)=>{
    console.log(ids[index]);
    console.log(id);
    return movies.some((movie) => movie.city === id);
  })
};

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