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Find Prime Numbers in a Range

Returns all prime numbers within a specified numeric range.

findPrimeNumbers​

Finds all primes between the start and end values (inclusive). If start > end, the range is automatically normalized.

Function Signature​

function findPrimeNumbers(start?: number, end?: number): number[];

Parameters​

  • start — The start of the range (default: 1).
  • end — The end of the range (default: 1000).

Returns​

  • An array of prime numbers within the specified range.

Examples​

findPrimeNumbers();            // [2, 3, 5, 7, 11, ..., 997]
findPrimeNumbers(10, 30);      // [11, 13, 17, 19, 23, 29]
findPrimeNumbers(30, 10);      // [11, 13, 17, 19, 23, 29] (auto normalized)
findPrimeNumbers(100, 105);    // [101, 103]

Aliases​

  • getPrimeNumbers

Notes​

  • Uses a simple filtering strategy via a helper isPrime() function.
  • Automatically corrects ranges where start > end.
  • Efficiency is acceptable for small-to-medium ranges, but not suitable for very large datasets (e.g. millions of numbers).

Conclusion​

Use findPrimeNumbers to quickly get prime numbers between any two values. The normalization logic ensures it’s safe to pass unordered inputs, making it flexible for user input-driven ranges.