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Use explicit default value

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atomiks
2017-12-14 20:24:07 +11:00
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snippets/standard-deviation.md
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@ -6,7 +6,7 @@ of the values to determine the standard deviation of an array of numbers.
Since there are two types of standard deviation, population and sample, you can use a flag to switch to population (sample is default). Since there are two types of standard deviation, population and sample, you can use a flag to switch to population (sample is default).
```js ```js
const standardDeviation = (arr, usePopulation) => { const standardDeviation = (arr, usePopulation = false) => {
const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length; const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;
return Math.sqrt( return Math.sqrt(
arr.reduce((acc, val) => acc.concat(Math.pow(val - mean, 2)), []) arr.reduce((acc, val) => acc.concat(Math.pow(val - mean, 2)), [])