Question

57

rated 0 times [ 58] [ 1] / answers: 1 / hits: 7414 / 3 Years ago, fri, november 13, 2020, 12:00:00

const a = [1,2,3]

const b = [1,0,1]



const c = dotProduct(a,b) // will equal 4

What's an efficient way of implementing the dotProduct method without importing any new libraries?

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answered 3 Years ago herman · Accepted Answer

dot = (a, b) => a.map((x, i) => a[i] * b[i]).reduce((m, n) => m + n);

console.log(dot([1,2,3], [1,0,1]));

Here we use Array.prototype.map to create a new array with multiplied results of each index and Array.prototype.reduce to sum the values of resulting array.