Today I learned the remaining string methods in JavaScript.
Yesterday, I posted on Dev Community about the string methods I had already learned.
Here is the URL of that post:
https://dev.to/laxmann/day-of-strengthening-my-dsa-fundamentals-javascript-string-methods-44b9
In that post, I covered the earlier methods.
Now I’m sharing the methods I learned today.
Let’s start by revising the string methods:
🔹 slice()
Extracts a section of a string and returns a new string without modifying the original one.
It takes two parameters:
startIndex
endIndex
The string between these two indexes is returned.
- The startIndex is included.
- The endIndex is excluded.
🔹 split()
Converts a string into an array.
It takes two parameters:
separator
limit
The separator defines where to split the string.
The limit defines how many items you want in the resulting array.
🔹 substring()
Works similarly to slice().
It takes:
startIndex
endIndex
And returns the part of the string between those indexes.
🔹 trim()
Removes whitespace from both ends of the string.
🔹 trimEnd()
Removes whitespace from the end of the string.
🔹 trimStart()
Removes whitespace from the beginning of the string.
🔹 startsWith()
Checks whether a string starts with a given character or substring.
Returns:
true
false
🔹 toLocaleUpperCase()
Converts a string to uppercase using locale-specific case mapping.
It can take a locale as a parameter.
🔹 toUpperCase()
Converts a string to uppercase using default Unicode rules (not locale-specific).
🔹 toLowerCase() / toLocaleLowerCase()
Same concept as uppercase methods, but converts the string to lowercase.
✅ What I Learned Today
Today I strengthened my understanding of:
- How string methods return new values
- The difference between slice() and substring()
- How split() works internally
The difference between locale-based and default Unicode case conversion
If you see any mistakes or have suggestions, please let me know.
I continually improve my DSA fundamentals.
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