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Commit 93af26e

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Merge branch 'master' of github.com:knaxus/problem-solving-javascript into problems
2 parents 4a75147 + 19222fb commit 93af26e

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6 files changed

+108
-11
lines changed

6 files changed

+108
-11
lines changed

‎README.md‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct
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- [FizzBuzz](src/_Problems_/fizzbuzz)
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- [String Permutaions](src/_Problems_/get-string-permutations)
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- [Get Subsequence](src/_Problems_/get_subsequence)
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- [Get Maze Path](src/_Problems_/get_subsequence)
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- [Get Maze Path](src/_Problems_/get-mazePath)
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- [Get longest consecutive 1s](src/_Problems_/max-consecutive-1s)
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- [Get Max Char](src/_Problems_/maxchar)
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- [Get Smallest Common Number](src/_Problems_/get-smallest-common-number)

‎src/_DataStructures_/DoublyLinkedList/index.js‎

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Original file line numberDiff line numberDiff line change
@@ -55,10 +55,12 @@ class DoublyLinkedList {
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display() {
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let address = this.head.next;
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let addresses = []
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while (address !== this.tail) {
59-
console.log(address.data);
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addresses.push(address.data)
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address = address.next;
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}
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return addresses
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}
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}
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‎src/_DataStructures_/Stack/postfix-expression-evaluation/index.js‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -15,9 +15,9 @@ function evaluatePostfixExpression(expression) {
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s.push(Number(char));
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} else {
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// if char is an operator then pop two elements from stack, evaluate them accordingly based on operator.
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//push the result to stack
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//push the result to stack
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let val1 = s.pop();
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let val2 = s.pop()
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let val2 = s.pop();
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switch (char) {
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case '+':
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s.push(val2 + val1);
@@ -38,3 +38,7 @@ function evaluatePostfixExpression(expression) {
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//pop the value of postfix expression
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return s.pop();
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}
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module.exports = {
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evaluatePostfixExpression,
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};
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@@ -0,0 +1,55 @@
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const { evaluatePostfixExpression } = require('.');
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describe('Postfix expression evaluation', function () {
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it('should be a function', function () {
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expect(typeof evaluatePostfixExpression).toEqual('function');
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});
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it('should return a number', function () {
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const expression = '11+';
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expect(typeof evaluatePostfixExpression(expression)).toEqual('number')
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});
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it('should handle addition', function () {
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const expression = '23+';
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const expected = 5;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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it('should handle subtraction', function () {
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const expression = '54-';
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const expected = 1;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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it('should handle multiplication', function () {
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const expression = '34*';
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const expected = 12;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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it('should handle division', function () {
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const expression = '62/';
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const expected = 3;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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it('should handle negative numbers', function () {
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const expression = '25-';
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const expected = -3;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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it('should handle multiple operators', function () {
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const expression = '123*+';
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const expected = 7;
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expect(evaluatePostfixExpression(expression)).toEqual(expected);
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});
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});
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@@ -0,0 +1,41 @@
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const { getMazePath } = require('.');
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describe('Get maze path', () => {
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it('returns all possible solutions for a 2x2 grid', () => {
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const expectedSolutions = ['HHVV', 'HVHV', 'HVVH', 'VHHV', 'VHVH', 'VVHH'];
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expect(getMazePath(0, 0, 2, 2)).toEqual(expectedSolutions);
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});
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it('returns an even amount of horizontal and vertical movements', () => {
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const solutions = getMazePath(0, 0, 3, 3);
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solutions.forEach(solution => {
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expect(solution.length).toEqual(6);
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expect(solution.match(/H/g).length).toEqual(3);
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expect(solution.match(/V/g).length).toEqual(3);
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});
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});
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it('returns the expected number of solutions based on given grids', () => {
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expect(getMazePath(0, 0, 1, 1).length).toEqual(2);
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expect(getMazePath(0, 0, 2, 2).length).toEqual(6);
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expect(getMazePath(0, 0, 3, 3).length).toEqual(20);
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expect(getMazePath(0, 0, 4, 4).length).toEqual(70);
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expect(getMazePath(1, 1, 4, 4).length).toEqual(20);
28+
});
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it('returns an empty array when the start and end coordinates are equal', () => {
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const solutions = getMazePath(2, 2, 2, 2);
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expect(solutions).toEqual(['']);
34+
});
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36+
it('returns an empty array when the start coordinates are greater than the end coordinates', () => {
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const solutions = getMazePath(2, 2, 1, 1);
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expect(solutions).toEqual([]);
40+
});
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});

‎src/_Problems_/get-mazePath/index.js‎

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Original file line numberDiff line numberDiff line change
@@ -7,10 +7,7 @@
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// --->> er = end row
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// --->> ec = end column
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let getMazePath = (cr, cc, er, ec) => {
10+
const getMazePath = (cr, cc, er, ec) => {
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if(cr == er && cc == ec) { //============POSITIVE BASE CASE===========
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let br = [];
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br.push('');
@@ -37,6 +34,4 @@ let getMazePath = (cr, cc, er, ec) => {
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return myResult;
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}
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let path = getMazePath(0, 0, 2, 2);
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console.log(path);
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module.exports = { getMazePath };

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