How to generate a random URL from a given array of strings?

Question

How can I generate a random URL by joining strings contained in an array (should also eliminate duplicates)?

Array of strings

let array=['flip','amazon','ebay','amazon']

expected output

['http://www.flip.com','http://www.amazon.com','http://www.ebay.com']

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Is it possible to generate a valid random url for an given length? @tkausl — hari prasanth, Jun 22 '19 at 06:14
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score 1 · Answer 1 · edited Jun 22 '19 at 06:59

1

You can try the following:

let array = ['flip', 'amazon', 'ebay', 'amazon']
/** Generating random number between 0 to length of array **/
let index = Math.floor(Math.random() * array.length);
console.log(`http://www.${array[index]}.com`);

edited Jun 22 '19 at 06:59

double-beep

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answered Jun 22 '19 at 06:18

Pushpendra Kumar

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In my opinion, with this level of a question, it's more productive to link it to another answer rather than "duplicating" an existing one – GalAbra Jun 22 '19 at 06:22

score 0 · Answer 2 · answered Jun 22 '19 at 07:06

try this

const array=['flip','amazon','ebay','amazon']
/*
[
  'http://www.flip.com',
  'http://www.amazon.com',
  'http://www.ebay.com'
]
*/

const keywords = []
for (const keyword of array) {
  if (!keywords.includes(keyword)) {
     keywords.push(keyword)
  }
}

const result = keywords.map(item => `http://www.${item}.com`)

console.log(result)

Shubham Dixit · Answer 3 · 2019-06-22T07:13:43.073

You can use Set to remove duplicates,And you can only select one random value at a time ,you just cant select whole array randomly .

let array=['flip','amazon','ebay','amazon']
let result=new Set(array.map(ele=>`http://www.${ele}.com`))
   // your expected output
console.log(Array.from(result)) // select random from here if this is what you looking for


//for getting random values 

var rand = Array.from(result)[Math.floor(Math.random() * Array.from(result).length)];
console.log(rand)

Random value generation referred From here

score 0 · Answer 4 · answered Jun 22 '19 at 07:15

First create the URLs - then use a Set to remove duplicates:

let array = ['flip', 'amazon', 'ebay', 'amazon']
const res = [...new Set(array.map(e => `http://www.${e}.com`))];
console.log(res);

You could also use reduce in two ways:

let array = ['flip', 'amazon', 'ebay', 'amazon']
const res = [...array.reduce((a, c) => (a.add(`http://www.${c}.com`), a), new Set())];
console.log(res);

Or:

let array = ['flip', 'amazon', 'ebay', 'amazon']
const res = Object.values(array.reduce((a, c) => (a[c] = a[c] || `http://www.${c}.com`, a), {}));
console.log(res);

How to generate a random URL from a given array of strings?

4 Answers4