18 lines
445 B
Markdown
18 lines
445 B
Markdown
---
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title: weightedAverage
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tags: math,array,beginner
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---
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Returns the weighted average of two or more numbers.
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- Use `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0` and divide by the `length` of the array.
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```js
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const weightedAverage = (nums, weights) =>
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nums.reduce((acc, n, i) => acc + (weights[i] * n), 0) / nums.length;
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```
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```js
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weightedAverage([1, 2, 3], [0.6,0.2,0.3]); // 0.6333
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```
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