how to record index after loop in java script

Question

im about to make a program that the output obtain the domain of the email. how to do that without built-in function such as .map .filter .reduce .split .join .indexOf .findIndex .substring i do search and many answer said i have to use for loop, i can find the "@" and find the "." but how to make those string between "@" and "." to be an output

ex: input = [email protected] output = gmail

 input = [email protected]
 output = yahoo

let input = "[email protected]"
let output = ""
let begin = ""
let end = ""

for (let i = 12; i<input.length; i++){
    if(input[i] == "@"){
        begin += input[i+1]
    }
}

for (let j = 0; j<input.length; j++){
    if(input[j] == "."){
        end += input[j-1]
    }
}

TheManbunlorian · Accepted Answer · 2020-11-10 21:21:26Z

1

function tmp() {

let input = "[email protected]"
let output = []
let didReachAt = false

for (let i = 0; i < input.length; i++) {
    if(input[i] == "@") {
       didReachAt = true
    } else if(input[i] == '.'){
       break
    } else if(didReachAt) {
       output.push(input[i])
    }
}

return output.join('')
}

console.log(tmp())

The key here is to only start appending to the output when you come across an @ and stop appending when you come across a . When you come across a ., you know you have your output so you can break and return the value.

answered Nov 10, 2020 at 21:21

TheManbunlorian

465 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Mursalin Over a year ago

Thx for the answer🙏

Coupe · Accepted Answer · 2020-11-10 21:18:23Z

0

let input = "[email protected]"

for (let i = 0;i<input.length;i++) {
  if (input[i] === '@') {
    var start = i+1
  } else if (input[i] === '.') {
    var end = i+1
    return 
  }
}

let output = input.substring(start,end)

Simple solution although this does not account for errors such as a false input

answered Nov 10, 2020 at 21:18

Coupe

3722 silver badges12 bronze badges

1 Comment

Mursalin Over a year ago

Thx for the answer🙏

PabloWeb18 · Accepted Answer · 2020-11-10 22:12:30Z

0

So i can see that you started with javascript, so you can learn better using code like this.

var input = "[email protected]"
var domainWithoutCom = input.split('@')[1].split('.')[0]
console.log(domainWithoutCom)

split can do the job for you!

EDIT:

Sorry about that, so i will create one version to you check my answer back :)

Check this, i think that can be improve, but can give you an idea :)

var email = '[email protected]';
var count = 0;
var domain = '';
var findFirst = false;
var searching = true;
do {
    var char = email[count];
    if (findFirst) {
        if (char == '.') {
            searching = false;
        } else {
            domain += char;
        }
    }
    else {
        if (char == '@') {
            findFirst = true;
        }
    }
    count += 1;
} while (searching == true);

console.log(domain)

edited Nov 10, 2020 at 22:12

answered Nov 10, 2020 at 21:20

PabloWeb18

4113 silver badges9 bronze badges

2 Comments

PabloWeb18 Over a year ago

@CalvinNunes check this now

Mursalin Over a year ago

Thx for the answer🙏

Collectives™ on Stack Overflow

how to record index after loop in java script

3 Answers 3

1 Comment

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related