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Commit19f4cc7

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Add recursive way of generating permutations with repetitions.
1 parentb0c55ec commit19f4cc7

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4 files changed

+123
-69
lines changed

4 files changed

+123
-69
lines changed
Lines changed: 49 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,55 @@
11
importpermutateWithRepetitionsfrom'../permutateWithRepetitions';
2-
importtestPermutateWithRepetitionsFnfrom'./testPermutateWithRepetitionsFn';
32

43
describe('permutateWithRepetitions',()=>{
54
it('should permutate string with repetition',()=>{
6-
testPermutateWithRepetitionsFn(permutateWithRepetitions);
5+
constpermutations0=permutateWithRepetitions([]);
6+
expect(permutations0).toEqual([]);
7+
8+
constpermutations1=permutateWithRepetitions(['A']);
9+
expect(permutations1).toEqual([
10+
['A'],
11+
]);
12+
13+
constpermutations2=permutateWithRepetitions(['A','B']);
14+
expect(permutations2).toEqual([
15+
['A','A'],
16+
['A','B'],
17+
['B','A'],
18+
['B','B'],
19+
]);
20+
21+
constpermutations3=permutateWithRepetitions(['A','B','C']);
22+
expect(permutations3).toEqual([
23+
['A','A','A'],
24+
['A','A','B'],
25+
['A','A','C'],
26+
['A','B','A'],
27+
['A','B','B'],
28+
['A','B','C'],
29+
['A','C','A'],
30+
['A','C','B'],
31+
['A','C','C'],
32+
['B','A','A'],
33+
['B','A','B'],
34+
['B','A','C'],
35+
['B','B','A'],
36+
['B','B','B'],
37+
['B','B','C'],
38+
['B','C','A'],
39+
['B','C','B'],
40+
['B','C','C'],
41+
['C','A','A'],
42+
['C','A','B'],
43+
['C','A','C'],
44+
['C','B','A'],
45+
['C','B','B'],
46+
['C','B','C'],
47+
['C','C','A'],
48+
['C','C','B'],
49+
['C','C','C'],
50+
]);
51+
52+
constpermutations4=permutateWithRepetitions(['A','B','C','D']);
53+
expect(permutations4.length).toBe(4*4*4*4);
754
});
855
});
Lines changed: 49 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,55 @@
11
importpermutateWithRepetitionsRecursivefrom'../permutateWithRepetitionsRecursive';
2-
importtestPermutateWithRepetitionsFnfrom'./testPermutateWithRepetitionsFn';
32

43
describe('permutateWithRepetitionsRecursive',()=>{
54
it('should permutate string with repetition',()=>{
6-
testPermutateWithRepetitionsFn(permutateWithRepetitionsRecursive);
5+
constpermutations0=permutateWithRepetitionsRecursive([]);
6+
expect(permutations0).toEqual([]);
7+
8+
constpermutations1=permutateWithRepetitionsRecursive(['A']);
9+
expect(permutations1).toEqual([
10+
['A'],
11+
]);
12+
13+
constpermutations2=permutateWithRepetitionsRecursive(['A','B']);
14+
expect(permutations2).toEqual([
15+
['A','A'],
16+
['A','B'],
17+
['B','A'],
18+
['B','B'],
19+
]);
20+
21+
constpermutations3=permutateWithRepetitionsRecursive(['A','B','C']);
22+
expect(permutations3).toEqual([
23+
['A','A','A'],
24+
['A','A','B'],
25+
['A','A','C'],
26+
['A','B','A'],
27+
['A','B','B'],
28+
['A','B','C'],
29+
['A','C','A'],
30+
['A','C','B'],
31+
['A','C','C'],
32+
['B','A','A'],
33+
['B','A','B'],
34+
['B','A','C'],
35+
['B','B','A'],
36+
['B','B','B'],
37+
['B','B','C'],
38+
['B','C','A'],
39+
['B','C','B'],
40+
['B','C','C'],
41+
['C','A','A'],
42+
['C','A','B'],
43+
['C','A','C'],
44+
['C','B','A'],
45+
['C','B','B'],
46+
['C','B','C'],
47+
['C','C','A'],
48+
['C','C','B'],
49+
['C','C','C'],
50+
]);
51+
52+
constpermutations4=permutateWithRepetitionsRecursive(['A','B','C','D']);
53+
expect(permutations4.length).toBe(4*4*4*4);
754
});
855
});

‎src/algorithms/sets/permutations/__test__/testPermutateWithRepetitionsFn.js

Lines changed: 0 additions & 51 deletions
This file was deleted.
Lines changed: 25 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -1,26 +1,37 @@
11
/**
22
*@param {*[]} permutationOptions
3+
*@param {number} permutationLength
4+
*@param {*[]} currentPermutation
5+
*@param {*[][]} permutations
36
*@return {*[]}
47
*/
58
exportdefaultfunctionpermutateWithRepetitionsRecursive(
6-
options,
7-
n=options.length||0,
8-
prefix=[],
9-
perms=[],
9+
permutationOptions,
10+
permutationLength=permutationOptions.length||0,
11+
currentPermutation=[],
12+
permutations=[],
1013
){
11-
// If initial options are null or empty then return empty array
12-
if(!options||!options.length)return[];
14+
// If initial options are null or empty then return empty array.
15+
if(!permutationOptions||!permutationOptions.length){
16+
return[];
17+
}
18+
19+
// If no more iterations required then add current permutation to permutations array.
20+
if(permutationLength===0){
21+
permutations.push(currentPermutation);
1322

14-
// If no more iterations then add current prefix to perms array
15-
if(n===0){
16-
perms.push(prefix);
17-
returnperms;
23+
returnpermutations;
1824
}
1925

20-
// Recursively find permutations and store in perms array
21-
options.forEach((option)=>{
22-
permutateWithRepetitionsRecursive(options,n-1,prefix.concat([option]),perms);
26+
// Recursively find permutations and store in permutations array.
27+
permutationOptions.forEach((permutationOption)=>{
28+
permutateWithRepetitionsRecursive(
29+
permutationOptions,
30+
permutationLength-1,
31+
currentPermutation.concat([permutationOption]),
32+
permutations,
33+
);
2334
});
2435

25-
returnperms;
36+
returnpermutations;
2637
}

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