Question

How to calculate the dot product of two arrays in TypeScript

Answer 1

function calculate_dot_product(arr1: number[], arr2: number[]) {
    let product: number = 0;
    const size:number = arr1.length;
     
    for (let i: number = 0; i < size; i++) {
        product += arr1[i] * arr2[i];
    }
     
    return product;
}
         
const arr1: number[] = [1, 4, 8, 9, 6];
const arr2: number[] = [0, 7, 1, 3, 40];
 
console.log("Dot product = " + calculate_dot_product(arr1, arr2));
 
 
 
 
/*
run:
 
"Dot product = 303" 
 
*/

 

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Answer 2

function calculate_dot_product(arr1: number[], arr2: number[]) {
    return arr1.reduce((accumulator, n, i) => accumulator + (n * arr2[i]), 0);
}
         
const arr1: number[] = [1, 4, 8, 9, 6];
const arr2: number[] = [0, 7, 1, 3, 40];
 
console.log("Dot product = " + calculate_dot_product(arr1, arr2));
 
 
 
 
/*
run:
 
"Dot product = 303" 
 
*/

 

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