Combining strings from an array while restricting repeated characters

I have an array of strings that need to be combined to form a single string, using a specific number referred to as the associatedNumber. This associatedNumber dictates that in the final result, all clusters of identical characters (from the array) should not exceed this associatedNumber in length.

Illustrative Example

exampleOutput = [
  'UUU', 'DD', 'UU',
  'UU', 'SSS','A',
  'B', 'C','U',
  'Y'
]

The desired output is:

UUUDDUUUSSSABCUY

Current Approach

The approach being taken currently is:

output = [
  'AAA', 'ZZZ', 'AA',
  'AA', 'X', 'K',
  'L', 'N', 'O',
  'P'
]
associatedNumber = 3;

for (i = 0; i < output.length; i++) {
    if (output[i] === associatedNumber);
    output.splice(i,1);
}
console.log(output)

Different Scenario

output = [
  'XXXX', 'GGG',
  'GG', 'XXX',
  'J', 'M',
  'H'
]

This should result in:

XXXGGGXXXJMH
javascriptarrayssorting

Answer №1

To create a single string from an array, you can concatenate all the elements and then replace any groups of characters that exceed a certain length with a substring of that maximum length. Achieve this by using a regular expression for the replacement process:

function convertToString(arr, maxLength) {
   let regex = RegExp(`((.)\\2{${maxLength-1}})\\2+`, "g");
   return arr.join("").replace(regex, "$1");
}

let inputArray = [
  'MMM', 'GG', 'MM',
  'MM',  'XX', 'A',
  'B',   'D',  'M',
  'Z'
];
console.log(convertToString(inputArray, 3));

Answer №2

output.join().replace(/,/g, '')

output = [
  'MMM', 'GG', 'MM',
  'MM',  'XX', 'A',
  'B',   'D',  'M',
  'Z'
]
newString = output.join().replace(/,/g, '')

console.log(newString)

MDN Reference: .join .replace

Answer №3

There are several techniques you can use to combine, compare, transform and merge strings.

function y(array, limit) {
    return array
        .join('')
        .match(/(.)\1*/g)
        .map(str => str.slice(0, limit))
        .join('');
}

console.log(y(['MMM', 'GG', 'MM', 'MM', 'XX', 'A', 'B', 'D', 'M', 'Z'], 3));

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