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Capitalize First Letter of Each Word

Certification: Basic Level Accuracy: 0% Submissions: 0 Points: 5

Write a JavaScript function to capitalize the first letter of each word in a given string. The function should convert the first character of every word to uppercase while keeping the rest of the characters in their original case.

Example 1
    
  
  • Input: str = "hello world programming"
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  • Output: "Hello World Programming"
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  • Explanation: 
    • The input string contains three words: "hello", "world", "programming". 
    • First letter of "hello" becomes "H", making it "Hello". 
    • First letter of "world" becomes "W", making it "World". 
    • First letter of "programming" becomes "P", making it "Programming". 
    • The final result is "Hello World Programming".
    •
Example 2
    
  
  • Input: str = "javascript is awesome"
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  • Output: "Javascript Is Awesome"
    • 
  
  • Explanation: 
    • The input string contains three words: "javascript", "is", "awesome". 
    • First letter of "javascript" becomes "J", making it "Javascript". 
    • First letter of "is" becomes "I", making it "Is". 
    • First letter of "awesome" becomes "A", making it "Awesome". 
    • The final result is "Javascript Is Awesome".
    •
Constraints
    
  
  • 1 ≤ str.length ≤ 1000
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  • The string may contain multiple spaces between words
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  • Words are separated by spaces
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  • Time Complexity: O(n) where n is the length of string
    • 
  
  • Space Complexity: O(n) for the result string
    •
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Hint
Solution

Solution Hints

    
  
  • Split the string into individual words using space as delimiter
    • 
  
  • Iterate through each word in the array
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  • For each word, capitalize the first character using toUpperCase()
    • 
  
  • Keep the rest of the characters as they are using substring()
    • 
  
  • Join all the processed words back with spaces
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  • Handle edge cases like empty strings or single characters
    •

Steps to solve by this approach:

 Step 1: Split the input string into an array of words using space as delimiter.
 Step 2: Use the map() method to transform each word in the array.
 Step 3: For each word, check if it's not empty to avoid errors.
 Step 4: Use charAt(0).toUpperCase() to capitalize the first character.
 Step 5: Use slice(1) to get the remaining characters of the word.
 Step 6: Concatenate the capitalized first character with the remaining characters.
 Step 7: Join all transformed words back into a single string with spaces.

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