Javascript First Letter Uppercase

Michael Zippo 04.11.2021

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There are many beginner code challenges that will help you start to think more like an engineer. One such challenge is where you capitalize the first letter of every word in a given string. In this article, we’ll take a look at the prompt and several possible solutions in JavaScript.

Given a function, capitalize, which includes str as a parameter, return that str with each word capitalized. Try to think of peak cases in your solution (not as input, wrong type of input, etc.).

Approach

Take a look again at the prompt. Write down or highlight any keywords you can find in the wording.
Combine the meaning of the word problem. Part of the hardest part of doing code challenges is trying to figure out what the problem is asking you to do. Understanding the problem will help you go a long way in solving it.
a possible pseudocode solution. It doesn’t have to be the actual code (it doesn’t need to be executable in your IDE or console browser - simple English is fine):

Solve the problem carefully step by step. It will help you think of tip cases - cases where an incorrect entry or an empty string may be passed - and how to break the problem down into logical steps. This is basically your experimentation phase - there are no wrong answers, just thoughts of how to approach the problem. These thoughts can be misleading or misguided - this is how you learn about won approaches to solving a problem

I have found that if I can break it down by explaining aloud, the logic is easier. Your mileage may vary depending on your approach, but I wanted to at least suggest in case it works for you! The nickname for a little problem like this seems like a little overkill, but if you practice the concept now it will be easier for you when working on much more difficult problems.

The solutions

Solution # 1: split () and loop with String.replace () and charAt () methods

leave = capitalize (str) => {= stop leave str.split (’’); for (either i = 0; i

In this first solution, we divide the string on its spaces. This gives us an arr each unique word as its index. The loop on the array gives us the possibility to access the personal indices of each string. We reassigned the string (the string in this case is arr [i]) to index i as a result of replacing the string at index 0 (arr [i] .charAt (0) with its value in uppercase. Arr in a string with spaces between each of the words

Solution # 2: split with the map method and slice

In this solution we start in a very similar way, but we use an ES6 array method called loop card through the network and the return of new values ‚Äã‚Äãthat capitalize the first character of each word. It does this by explicitly setting out what we’ll do with the toUpperCase () for the first letter, the slice () for the rest of the string, and the strings concatenate for get the new version of the word. Then we merge the array and return it

Solution n ¬∞ 3: regular expressions

allow leverage = (str) => {let regex = / (^ | s) S / g return str.replace (regex, letter => letter.toUpperCase ()); } Leave root = document.getElementById (’root’); root.innerHTML = JSON.stringify (capitalize (quick brown fox jumped on lazy dog ‚Äã‚Äã’));

In this solution, we use a regular expression to find all non-white characters (S) at the start of the string (^ ) or after a space character (s). The indicator g at the end means global and allows us to find all instances of this model. Then we use the replace method to replace that regex pattern with a function that takes that letter and returns it in uppercase.