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Added CartesianProduct.js #1082

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24 changes: 24 additions & 0 deletions Maths/CartesianProduct.js
View file Open in desktop
Original file line number Diff line number Diff line change
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/**
* @function cartesianProduct
* @description Generate Cartesian Product of Two Sets.
* @param {*[]} setA -First set
* @param {*[]} setB -Second set
* @return {*[]} -Cartesian Product of setA and setB
*/
const cartesianProduct = (setA, setB) => {
// Check if input sets are not empty.
if (!setA || !setB || !setA.length || !setB.length) {
return null
}
const product = []

for (let indexA = 0; indexA < setA.length; indexA += 1) {
for (let indexB = 0; indexB < setB.length; indexB += 1) {
product.push([setA[indexA], setB[indexB]])
}
}

return product
}

export { cartesianProduct }
21 changes: 21 additions & 0 deletions Maths/test/CartesianProduct.test.js
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import { cartesianProduct } from '../CartesianProduct'

describe('cartesianProduct', () => {
it('should return null if not enough info for calculation', () => {
const product1 = cartesianProduct([1], null)
const product2 = cartesianProduct([], null)

expect(product1).toBeNull()
expect(product2).toBeNull()
})

it('should calculate the product of two sets', () => {
const product1 = cartesianProduct([1], [1])
const product2 = cartesianProduct([1, 2], [3])
const product3 = cartesianProduct([1, 2], [3, 4])

expect(product1).toEqual([[1, 1]])
expect(product2).toEqual([[1, 3], [2, 3]])
expect(product3).toEqual([[1, 3], [1, 4], [2, 3], [2, 4]])
})
})

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