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fix(learn): Update text as code for vector-dot-product (#40460)

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* fix: implemented suggestted changes

* fix: correct last test expected return value

* fix: remove slash

Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com>

* fix: remove slash

Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com>

* fix: add test to return null if more than 2 vectors

Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com>

* fix: added correct solution

* fix: removed extra brackets

Co-authored-by: Yuval Levental <yhl3051@rit.edu>

Co-authored-by: Lakshya Baghel <lakshyab.1999@gmail.com>
Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com>
Co-authored-by: Yuval Levental <yhl3051@rit.edu>
This commit is contained in:
Randell Dawson
2021-01-20 22:23:10 -07:00
committed by GitHub
parent fb2e5d81f3
commit dd4c7e0097
1 changed files with 18 additions and 32 deletions
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50
curriculum/challenges/english/10-coding-interview-prep/rosetta-code/vector-dot-product.md
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@ -8,57 +8,54 @@ dashedName: vector-dot-product
# --description-- # --description--
A vector is defined as having three dimensions as being represented by an ordered collection of three numbers: (X, Y, Z). A vector can have one or more values represented by an ordered collection. Examples could be (x), (x, y), or (x, y, z).
# --instructions-- # --instructions--
Write a function that takes any numbers of vectors (arrays) as input and computes their dot product. Your function should return `null` on invalid inputs such as vectors of different lengths. Write a function that takes two vectors (represented as one-dimensional arrays) as input and computes their dot product. Your function should return `null` on invalid inputs such as vectors of different lengths or passing anything other than two vectors.
# --hints-- # --hints--
dotProduct should be a function. `dotProduct` should be a function.
```js ```js
assert.equal(typeof dotProduct, 'function'); assert.equal(typeof dotProduct, 'function');
``` ```
dotProduct() should return null. `dotProduct()` should return `null`.
```js ```js
assert.equal(dotProduct(), null); assert.equal(dotProduct(), null);
``` ```
dotProduct(\[[1], [1]]) should return 1. `dotProduct([1], [1])` should return `1`.
```js ```js
assert.equal(dotProduct([1], [1]), 1); assert.equal(dotProduct([1], [1]), 1);
``` ```
dotProduct(\[[1], [1, 2]]) should return null. `dotProduct([1], [1, 2])` should return `null`.
```js ```js
assert.equal(dotProduct([1], [1, 2]), null); assert.equal(dotProduct([1], [1, 2]), null);
``` ```
dotProduct([1, 3, -5], [4, -2, -1]) should return 3. `dotProduct([1, 3, -5], [4, -2, -1])` should return `3`.
```js ```js
assert.equal(dotProduct([1, 3, -5], [4, -2, -1]), 3); assert.equal(dotProduct([1, 3, -5], [4, -2, -1]), 3);
``` ```
`dotProduct(...nVectors)` should return 156000. `dotProduct([3, 2, 1], [2, 4, 2], [5, 3, 1])` should return `null`.
```js ```js
assert.equal( assert.equal(dotProduct([3, 2, 1], [2, 4, 2], [5, 3, 1]), null);
dotProduct( ```
[0, 1, 2, 3, 4],
[0, 2, 4, 6, 8], `dotProduct([ 0, 3, 6, 9, 12 ], [ 0, 4, 8, 12, 16 ])` should return `360`.
[0, 3, 6, 9, 12],
[0, 4, 8, 12, 16], ```js
[0, 5, 10, 15, 20] assert.equal(dotProduct([ 0, 3, 6, 9, 12 ], [ 0, 4, 8, 12, 16 ]), 360);
),
156000
);
``` ```
# --seed-- # --seed--
@ -75,29 +72,18 @@ function dotProduct(...vectors) {
```js ```js
function dotProduct(...vectors) { function dotProduct(...vectors) {
if (!vectors || !vectors.length) { if (!vectors || !vectors.length || vectors.length > 2 || vectors[0].length !== vectors[1].length) {
return null;
}
if (!vectors[0] || !vectors[0].length) {
return null; return null;
} }
const vectorLen = vectors[0].length; const vectorLen = vectors[0].length;
const numVectors = vectors.length;
// If all vectors not same length, return null
for (let i = 0; i < numVectors; i++) {
if (vectors[i].length !== vectorLen) {
return null; // return undefined
}
}
let prod = 0; let prod = 0;
let sum = 0; let sum = 0;
let j = vectorLen; let j = vectorLen;
let i = numVectors; let i = 2;
// Sum terms // Sum terms
while (j--) { while (j--) {
i = numVectors; i = 2;
prod = 1; prod = 1;
while (i--) { while (i--) {