Day #5 Pro Tip #Javascript

Simplify if condition — Use indexOf

Do you have one variable to be checked against multiple values ?

For e.g. Jack will be happy when he will get to eat Mango, Apple, Grapes or Guava

Trivial code is :

if(fruit === ‘Apple’ || fruit === ‘Mango’ || fruit === ‘Grapes’ || fruit === ‘Guava’) {
  // Jack will be happy
}

But Jack is not happy with this code

Smart code is :

if([‘Apple’, ‘Mango’, ‘Grapes’, ‘Guava’].indexOf(fruit) > -1) {
  // Jack will be happy
}

Read more about Array.prototype.indexOf

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