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Format Number as Currency

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

Write a JavaScript program to format a given number as currency with proper thousand separators and decimal places. The function should handle both positive and negative numbers and format them according to standard currency display rules.

Example 1
    
      
  • Input: num = 1234567.89
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  • Output: "$1,234,567.89"
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  • Explanation: 
    • The input number is 1234567.89. 
    • Add dollar sign at the beginning. 
    • Insert commas every three digits from right to left in the integer part. 
    • Ensure two decimal places are displayed. 
    • Result is "$1,234,567.89".
    •
Example 2
    
      
  • Input: num = -5000
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  • Output: "-$5,000.00"
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  • Explanation: 
    • The input number is -5000 (negative). 
    • Keep the negative sign at the beginning. 
    • Add dollar sign after the negative sign. 
    • Add comma separator for thousands. 
    • Add two decimal places (.00). Result is "-$5,000.00".
    •
Constraints
    
      
  • -999,999,999.99 ≤ num ≤ 999,999,999.99
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  • Always display exactly 2 decimal places
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  • Use comma as thousand separator
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  • Handle negative numbers with proper sign placement
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  • Time Complexity: O(n), where n is the number of digits
    • 
      
  • Space Complexity: O(n)
    •
NumberTCS (Tata Consultancy Services)KPMG
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Hint
Solution

Solution Hints

    
      
  • Convert the number to string and handle the sign separately
    • 
      
  • Split the number into integer and decimal parts
    • 
      
  • Add commas to the integer part by iterating from right to left
    • 
      
  • Ensure exactly 2 decimal places are displayed
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  • Combine sign, dollar symbol, formatted integer, and decimal parts
    •

Steps to solve by this approach:

 Step 1: Extract the sign of the number and work with absolute value.
 Step 2: Convert number to fixed 2 decimal places and split into integer and decimal parts.
 Step 3: Process the integer part from right to left, adding commas every 3 digits.
 Step 4: Build the formatted integer string with proper comma placement.
 Step 5: Combine the dollar sign, formatted integer part, and decimal part.
 Step 6: Add the negative sign at the beginning if the original number was negative.
 Step 7: Return the complete formatted currency string.

Submitted Code :