looking for better way than having switch statement in array.map for javascript

Question

looking for better way than having switch statement in array.map for javascript. Basically is there a better way to change all the values in an array given an object or something? In this case i want to abbreviate or change all the values of an array to different values given. should i use another map or another object? Javascript Es6 question I have this:

const abvDepartments = departments.map(equip => {
  switch (equip) {
    case 'service':
      return 'Svc';
      break;
    case 'help':
      return 'HLP';
      break;
    case 'contracts':
      return 'Con';
      break;
    default:
      return '';
  }
});

Does this answer your question? Alternative to the "switch" Statement — Heretic Monkey
– Heretic Monkey, Commented Jul 20, 2020 at 19:52

Tim Perry · Accepted Answer · 2020-07-20 18:48:05Z

3

There's many possibilities here, but one option would be something like this:

const abvDepartments = departments.map(equip => {
  return {
    'service': 'Svc',
    'help': 'HLP',
    'contracts': 'Con'
  }[equip] || '';
});

If you'd like, and you're not doing anything else in the map, you can shorten that even further:

const abvDepartments = departments.map(equip => ({
  'service': 'Svc',
  'help': 'HLP',
  'contracts': 'Con'
}[equip] || ''));

edited Jul 20, 2020 at 18:48

answered Jul 20, 2020 at 18:46

Tim Perry

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2 Comments

jonrsharpe Over a year ago

|| '', for the default.

Sanchit Goel Over a year ago

+1 for this. one more thing I would suggest here. as an object is a constant therefore make it const outside the method and use it inside const depCode = { 'service': 'Svc', 'help': 'HLP', 'contracts': 'Con' } const abvDepartments = departments.map(equip => depCode[equip] || '' );

Sawan Patodia · Accepted Answer · 2020-07-20 18:48:55Z

3

You can keep an object like below:

const options = {'service':'Svc','help': 'HLP' }

and then :

const abvDepartments = departments.map(equip => options[equip] || "");

answered Jul 20, 2020 at 18:48

Sawan Patodia

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Comments

Sanchit Goel · Accepted Answer · 2020-07-20 18:54:16Z

0

declare constants outside your logic and that will always be neat. Happy Coding :)

// declare constants with uppercase
const DEP_CODE = {
  'service': 'Svc',
  'help': 'HLP',
  'contracts': 'Con'
}

const abvDepartments = departments.map(equip => DEP_CODE[equip] || '' );

answered Jul 20, 2020 at 18:54

Sanchit Goel

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