Check if string value is present within array and return found array value(s) js

Question

I have key identifiers that look like this...

const category = key; // could be "bus","car","plane"

for this example lets go with "bus". I also have an array of strings that look like this...

let transportationFields = [
      'bus_station', 'bus_stop', 'bus_line', 'took_bus'
      'car', 'buyer_of_car', 'car_model',
      'train_number', 'train_trip_num', 'train_stop',
    ];

Right now I'm grabbing the index of

const transFieldValues = transportationFields.indexOf(category) > -1;

But that just returns true. How can I also grab the field it matched to? For example. Since category = bus. How can I return all the values it threw true to? ('bus_station', 'bus_stop', 'bus_line', 'took_bus') ?

Thank you for your help in advance!

trincot · Accepted Answer · 2016-05-12 22:00:48Z

4

You can use .filter() for finding all matches and return them in an array:

let transportationFields = [
  'bus_station', 'bus_stop', 'bus_line', 'took_bus',
  'car', 'buyer_of_car', 'car_model',
  'train_number', 'train_trip_num', 'train_stop',
];

let category = 'bus';

let transFieldValues = transportationFields.filter(function (item) {
  return item.indexOf(category) > -1;
});

document.write (JSON.stringify(transFieldValues));

Or with ES6 arrow function:

let transportationFields = [
  'bus_station', 'bus_stop', 'bus_line', 'took_bus',
  'car', 'buyer_of_car', 'car_model',
  'train_number', 'train_trip_num', 'train_stop',
];

let category = 'bus';

let transFieldValues = transportationFields.filter(w => w.indexOf(category) > -1);

document.write (JSON.stringify(transFieldValues));

If you don't mind leaving Edge users out of luck, then you can use .includes():

let transFieldValues = transportationFields.filter(w => w.includes(category));

... which just looks nicer than this > -1 you have to use with .indexOf().

edited May 12, 2016 at 22:00

answered May 12, 2016 at 21:39

trincot

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3 Comments

Modelesq Over a year ago

I think you've got the right answer, i'm just trying to reproduce the syntax is react

Aaron Beall Over a year ago

transportationFields.filter(text => text.includes(category))

trincot Over a year ago

The Edge browser does not support includes(). But who cares ;-)

Nenad Vracar · Accepted Answer · 2016-05-12 21:48:54Z

2

You can use Array#filter

let transportationFields = [
  'bus_station', 'bus_stop', 'bus_line', 'took_bus',
  'car', 'buyer_of_car', 'car_model',
  'train_number', 'train_trip_num', 'train_stop',
];

transportationFields = transportationFields.filter(e => {
  return e.indexOf('bus') != -1;
});

console.log(transportationFields)

You can also create a function and pass value to search

let transportationFields = ['bus_station', 'bus_stop', 'bus_line', 'took_bus','car', 'buyer_of_car', 'car_model','train_number', 'train_trip_num', 'train_stop'];

var findField = function(input) {
  return transportationFields.filter(e => {return e.indexOf(input) != -1;});
}

console.log(findField('bus'));

edited May 12, 2016 at 21:48

answered May 12, 2016 at 21:39

Nenad Vracar

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