Question 373766 in Javascript Question posted in
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Javascript – How to multiply all elements of a first array by elements another one?

Suppose we have two arrays of different lengths:

let array1 = [22, 42, 28, 100, 28, 48, 38, 48, 26, 32, 58, 36, 28, 42, 42, 38, 28, 28, 38, 24, 32, 38, 38, 28, 46, 38, 42, 46, 32, 46, 38, 48, 9, 6, 5, 8, 5, 56, 24, 32, 5, 46];

let array2 = [25, 50, 75, 100, 150, 250];

It’s necessary multiplication be performed in this way:
22×25, 22×50, 22×75 … 42×25, 42×50 …

How to do this correctly?

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4

Answers


  1. 0

    You can use Array::reduce() and Array::map() to collect the values:

    let array1 = [22, 42, 28, 100, 28, 48, 38, 48, 26, 32, 58, 36, 28, 42, 42, 38, 28, 28, 38, 24, 32, 38, 38, 28, 46, 38, 42, 46, 32, 46, 38, 48, 9, 6, 5, 8, 5, 56, 24, 32, 5, 46];

let array2 = [25, 50, 75, 100, 150, 250];


const result = array1.reduce((r, n) => (r.push(...array2.map(n2 => n * n2)), r), []);

console.log(result);
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  2. 0

    Here you can do one thing…

    let array1 = [22, 42, 28, 100, 28, 48, 38, 48, 26, 32, 58, 36, 28, 42, 42, 38, 28, 28, 38, 24, 32, 38, 38, 28, 46, 38, 42, 46, 32, 46, 38, 48, 9, 6, 5, 8, 5, 56, 24, 32, 5, 46];

let array2 = [25, 50, 75, 100, 150, 250];

const res = array1.map(a => array2.map(b => a*b))
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  3. 0

    Get ready to dive into the exciting world of JavaScript! We’re going to multiply each element of one array by each element of another, using nested loops. Here’s a handy code snippet to get you started:

    javascript

    let array1 = [22, 42, 28, 100...];

let array2 = [25, 50, 75, 100...];

let resultArray = [];

for (let i = 0; i< array1.length; i++) {

for (let j = 0; j< array2.length; j++) {

resultArray.push(array1[i] * array2[j]);

}

}

console.log(resultArray);

    In this thrilling piece of code:

    • We’ve got our arrays array1 and array2 all set up.

    • We create a shiny new empty resultArray where we’ll store our multiplication results.

    • Our nested loops are at work here: the outer loop takes a tour through array1, while the inner loop explores array2.

    • Inside these loops is where the magic happens: we multiply elements from both arrays and push the results into our resultArray.

    • And voila! We log resultArray to reveal all those multiplied values.

    -NAMASTE(0_0)

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  4. 0

    You could map the products.

    const
    array1 = [22, 42, 28, 100, 28, 48, 38, 48, 26, 32, 58, 36, 28, 42, 42, 38, 28, 28, 38, 24, 32, 38, 38, 28, 46, 38, 42, 46, 32, 46, 38, 48, 9, 6, 5, 8, 5, 56, 24, 32, 5, 46],
    array2 = [25, 50, 75, 100, 150, 250],
    result = array1.map(v => array2.map(w => v * w));

result.forEach(a => console.log(...a));
    .as-console-wrapper { max-height: 100% !important; top: 0; }
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