Swtich/if... else Alternative Statement _ javascript tips-js tutorial

This article mainly introduces swtich/if... else substitution statement related information, you can refer to many times, if... else... if you have many options for determining the branch, you will see:

if (animal === 'dog') { // TO DO 'dog'} else if (animal === 'cat') { // TO DO 'cat' } else if (animal === 'bird') { // TO DO 'bird' } else if (animal === 'fish') { // TO DO 'fish' } else {  // TO DO 'other' }

It is really easy to understand, and easy to write, all the way is else if, too many option branches, some people use swtich to write like this:

swtich (animal) {  case 'dog':    // TO DO 'dog'    break;  case 'cat':    // TO DO 'cat'     break;  case 'bird':    // TO DO 'bird'     break;  case 'fish':    // TO DO 'fish'    break;   default:    // TO DO 'other'}

However, we can still use the Object hash idea for reference:

function getAnimalName(name) {  var animals = {    'dog': function () {      return 'dog';    },    'cat': function() {      return 'cat';    },    'bird': function() {      return 'bird';    },    'fish': function() {      return 'fish';    },    'default': function() {      return 'other';    }  };  return (animals.name || animals.default)();}var animal = getAnimalName('dog');console.log(animal);// 'dog'

The above is all the content of this article. I hope you will like it.