Created
December 10, 2015 02:05
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Password Permutations
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| var replacements = { | |
| p: ['P', '1'], | |
| a: ['A', '@'], | |
| b: ['B'], | |
| s: ['S', '$'], | |
| o: ['O', '0'], | |
| w: ['W'] | |
| }; | |
| function permutations(state, word, index) { | |
| if (index >= word.length) { | |
| return state; | |
| } | |
| var letter = word[index]; | |
| var alternatives = replacements[letter] || []; | |
| // clone array for immutability | |
| alternatives = alternatives.slice(); | |
| alternatives.push(letter) | |
| var newState; | |
| if (state.length === 0) { | |
| newState = alternatives; | |
| } else { | |
| newState = []; | |
| state.forEach(function(partial) { | |
| alternatives.forEach(function(alternative) { | |
| newState.push(partial + alternative); | |
| }); | |
| }); | |
| } | |
| return permutations(newState, word, index + 1); | |
| } | |
| var res = permutations([], 'password', 0); | |
| console.log(res); |
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