How to Split String by Length in Typescript?

Do you need to split string by length in Typescript? In this Typescript tutorial, I will explain how to split a string by length in Typescript using various methods.

There are various methods to split a string by length in Typescript:

• Using custom function
• Using regular expression
• Using Array.from() Method, etc.

1. Using a Custom Function

One way to split a string by length in TypeScript is to write a custom function that loops through the string and extracts substrings of the desired length. Here’s a simple function that does just that:

function chunkString(str: string, length: number): string[] {
  const chunks: string[] = [];
  let index = 0;

  while (index < str.length) {
      chunks.push(str.substring(index, index + length));
      index += length;
  }

  return chunks;
}

// Example usage:
const result = chunkString("United States of America", 3);
console.log(result);

In this example, the chunkString function takes two parameters: the string to split (str) and the length of each chunk (length). It uses a while loop to go through the string, and the substring method to extract chunks of the specified size.

After I executed the code using VS code, you can see the output in the screenshot below:

2. Using Regular Expressions

Another approach to splitting a string by length in Typescript is to use regular expressions. Here’s an example of how you can use a regular expression to achieve the same result:

function splitStringByLength(str: string, length: number): string[] {
    const regex = new RegExp(`.{1,${length}}`, 'g');
    return str.match(regex) || [];
}

// Example usage:
const result = splitStringByLength("UnitedStatesOfAmerica", 4);
console.log(result);

The regular expression .{1,${length}} matches any character (.) between 1 and length times, and the g flag indicates that the match should be performed globally across the entire string. The match method then extracts all matches into an array.

You can see the output in the screenshot below after I executed the code using Visual Studio code:

3. Using Array.from() Method

If you want to use a more functional programming approach, you can utilize the Array.from() method to split a string into chunks of equal length in Typescript. Here’s how you can do it:

function splitIntoChunks(str: string, length: number): string[] {
    return Array.from(
        { length: Math.ceil(str.length / length) },
        (_, i) => str.substring(i * length, (i + 1) * length)
    );
}

// Example usage:
const result = splitIntoChunks("HelloTypeScript", 5);
console.log(result); // Output: ['Hello', 'TypeS', 'cript']

In this function, Array.from() is used to create a new array with a length equal to the number of chunks. The second argument is a mapping function that takes the index (i) and returns a substring of the appropriate length.

Conclusion

Splitting a string by length in TypeScript is possible by using a custom function, regular expressions, or the Array.from() method. I hope now you have an idea of how to split a string by length in Typescript.

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