Intro π
Problem solving is an important skill, for your career and your life in general.
That's why I take interesting katas of all levels, customize them and explain how to solve them.
Understanding the Exerciseβ
First, we need to understand the exercise!
If you don't understand it, you can't solve it!.
My personal method:
- Input: What do I put in?
- Output: What do I want to get out?
Today's exercise
Today, another 7 kyu
kata,
meaning we slightly increase the difficulty.
Source: Codewars
Write a function splitInParts
, that accepts two parameters: myString
and partLength
.
Given a string, e.g. "HelloDev"
,
and a number, e.g. 3
,
return the input string split into partLength
-long parts separated by a space, e.g. Hel loD ev
.
Input: a string and a number.
Output: a string.
Thinking about the Solution π
I think I understand the exercise (= what I put into the function and what I want to get out of it).
Now, I need the specific steps to get from input to output.
I try to do this in small baby steps:
- Get a
partLength
-long part of the input string and add a space - Do this for every part
- Add the remaining part to the end
- Return the string
Example:
- Input:
"HelloDev", 3
- Get a
3
-long part of the input string and add a space:"Hel "
- Get a
3
-long part of the input string and add a space:"loD "
- Add the remaining part to the end:
"ev"
- Return the string:
"Hel loD ev"
- Output:
"Hel loD ev"
β
Implementation β
function splitInParts(myString, partLength) {
let remaining = myString;
let result = "";
// do it only if the remaining string is longer than the parts
while (remaining.length >= partLength) {
// add the next part and a space to the result
result += remaining.slice(0, partLength) + " ";
// remove the added part from the remaining string
remaining = remaining.slice(partLength);
}
// add the last part that was smaller than the part length
result += remaining;
// remove a trailing space
return result.trim();
}
Result
console.log(splitInParts("HelloDev", 3));
// "Hel loD ev" β
console.log(splitInParts("HelloDev", 1));
// "H e l l o D e v" β
Playground β½
You can play around with the code here
Next Part β‘οΈ
Great work!
We learned how to use while
, slice
, trim
.
I hope you can use your new learnings to solve problems more easily!
Next time, we'll solve another interesting kata. Stay tuned!
If I should solve a specific kata, shoot me a message here.
If you want to read my latest stuff, get in touch with me!
Further Reading π
Questions β
- How often do you do katas?
- Which implementation do you like more? Why?
- Any alternative solution?
Top comments (4)
Okay, this one is easy enough for me..
Another possible solution.
let splitInParts = (myString, partLength) => {
let res = ""
let count = 0
}
Another golf-style solution that doesn't abuse regular expressions π
Here's the less abusive solution I would actually use:
This works because
String.prototype.slice()
will stop at the end of the string if the second argument index is out of bounds.