Write a function to chop string into chunks of given length and return it as array.
Example
Input: 'javascript' 3 Output: ['jav','asc','rip','t']
We can solve this problem with two different approaches.
1. Bruteforce.
2. Regex.
Bruteforce approach
It is extremely straight forward, iterate each character of the string and keep on slicing the characters of the given size and pushing it into the output array.
const chop = (str, size = str.length) => {
const arr = [];
let i = 0;
//iterate the string
while (i < str.length) {
//slice the characters of given size
//and push them in output array
arr.push(str.slice(i, i + size));
i = i + size;
}
return arr;
}
Input:
console.log(chop('javascript', 3));
Output:
["jav","asc","rip","t"]
Using Regex
We often tend to ignore the Regex based solution as it is not easy to remeber the expressions, but the Regex method accepts the size which can be used to extract at-most n-sized sub strings.
Syntax
str.match(/.{1,n}/g); // Replace n with the size of the substring
If the string contains any newlines or carriage returns, then use this expression.
str.match(/(.|[\r\n]){1,n}/g); // Replace n with the size of the substring
String.prototype.match() returns an array of matching string with a regular expression. Passing the regex to it will returns the array of n-sized sub strings.
const chop = (str, size = str.length) => {
return str.match(new RegExp('.{1,' + size + '}', 'g'));
}
Input:
console.log(chop('javascript', 3));
Output:
["jav","asc","rip","t"]
