Script – 13-35 Jan 19

SScript

1/19/2022

I have this code which is supposed to return lonely integers(the one that occurs once in the array)

function lonelyinteger(a) {
  let allA = [];
  let allB;

  for (i = 0; i < a.length; i++) {
    allA.push(a.filter((string) => string === a[i]));

    if (allA[i].length === 1) {
      allB = allA[i].toString();
    }
  }

  return allB;
}

function lonelyinteger(a) {
  let allA = [];
  let allB;

  for (i = 0; i < a.length; i++) {
    allA.push(a.filter((string) => string === a[i]));

    if (allA[i].length === 1) {
      allB = allA[i].toString();
    }
  }

  return allB;
}

It works perfectly but hacker rank keeps rejecting it and I'm not really sure why This is the error I get

SScriptyChris

1/19/2022

for (i = 0; i < a.length; i++) {

for (i = 0; i < a.length; i++) {

you have undeclared i variable in strict mode that's error https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode#converting_mistakes_into_errors

SScript

1/19/2022

ohhh I defined i now and it works is it recommended to define i?

for (let i=0; i < a.length; i++) {

for (let i=0; i < a.length; i++) {

UUUnknown User

1/19/2022

Message Not Public

SScriptyChris

1/19/2022

you ask about variable name or the fact of declaring a variable? For name, it's up to you - the clue is to name variable according to it's usage context so it will be easy for any dev to know what's used for. For not declaring variables - it's a risky thing and works only in non-strict mode (which is less and less present these days, because it's automatically turned on in ESM modules and Classes)

SScript

1/19/2022

noted I meant declaring variable in for loops yhhh thanks catjam

SScriptyChris

1/19/2022

you don't have do declare variable in the loop, you can declare it outside the loop - it depends on use case. But still, it's a good practice (and must have in strict mode) to declare all variables

SScript

1/19/2022

roger that

UUUnknown User

1/19/2022

Message Not Public

SScript

1/19/2022

my linter didnt<:emoji_21:773183935264849930> do u mean without using strict mode?

UUUnknown User

1/19/2022

3 Messages Not Public

SScript

1/19/2022

sheesh I just discovered I do not have any js linter just the one built-in vs code which one do u recommend I see

UUUnknown User

1/19/2022

2 Messages Not Public

SScript

1/19/2022

oh I have that <:emoji_21:773183935264849930> nah just vanilla js

UUUnknown User

1/19/2022

Message Not Public

SScript

1/19/2022

<:roger_okay:932725392098349157>

UUUnknown User

1/20/2022

Message Not Public

Looking for more? Join the community!

Reactiflux

Script – 13-35 Jan 19

Join Server

Reactiflux

Script – 13-35 Jan 19

Join Server

Want results from more Discord servers?

Add your server