CODEWITHSUNDEEP
javascriptarraysfilter
Munish Kapoor
Munish Kapoor

Reputation: 3339

Javascript for loop to filter conversion

I have following script which filter the data using for loop as shown

let i;
const filteredFriends = [];

for (i = 0; i < users.length; i += 1) {
  if (this.isUserExist(users[i]) {
    filteredFriends.push(users[i]);
  }
}

How can i covert it into filter

any idea please

Upvotes: 0

Views: 64

Answers (4)

Siva Kondapi Venkata
Siva Kondapi Venkata

Reputation: 11001

filter method need to return boolean value. your function this.isUserExist seems doing that as you have used in if condition.

Use it like.

const filteredFriends = users.filter(this.isUserExist);

Upvotes: 0

Jawad
Jawad

Reputation: 198

Simply do this:

const users = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];
let filteredFriends = users.filter(user => this.isUserExist(user));
console.log(filteredFriends);

Upvotes: 0

Sascha A.
Sascha A.

Reputation: 4616

let filteredFriends = users.filter(user => {
    return this.isUserExist(user);
});

Upvotes: 0

Barmar
Barmar

Reputation: 781068

Simply use the if condition in the callback function of filter(). Replace user[i] with the callback function parameter.

const filteredFriends = users.filter(u => this.isUserExist(u))

Make sure you use an arrow function so that this will be inherited in the callback function. If you need compatibility with older implementations that don't have arrow functions, see How to access the correct `this` inside a callback?

Upvotes: 2

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