Random Quote Generator

A curated corpus of 100+ verified quotes from philosophers, scientists, writers, and leaders spanning 2500 years of recorded thought. Each quote is attributed with author and approximate year. The selection algorithm uses a shuffle-based approach to guarantee every quote appears exactly once before any repetition occurs - unlike naive Math.random calls that produce clustering and repeats. Category filtering narrows the pool before shuffling. Favorites persist across sessions via LocalStorage. Note: attribution of ancient quotes is approximate and may reflect popular consensus rather than verified primary sources.

The selection mechanism avoids naive random indexing, which produces a probability of repeat within n draws from a pool of N quotes:

Instead, a Fisher-Yates shuffle is applied to the index array, producing a permutation where each element occupies each position with uniform probability 1N. The algorithm iterates from index i = N − 1 down to 1, swapping each element with a randomly chosen element at index j where 0 ≤ j ≤ i. Time complexity is O(N), space complexity O(1) in-place.

Where N = total quotes in active pool, n = number of draws, i = current iteration index, j = random swap target index.