Travis build: 784 [ci skip]
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36
README.md
36
README.md
@ -177,6 +177,7 @@
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* [`round`](#round)
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* [`standardDeviation`](#standarddeviation)
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* [`sum`](#sum)
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* [`sumPower`](#sumpower)
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</details>
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@ -237,7 +238,7 @@
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</details>
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### 💎 Utility
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### 🔧 Utility
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<details>
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<summary>View contents</summary>
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@ -3094,6 +3095,36 @@ sum([1, 2, 3, 4]); // 10
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<br>[⬆ Back to top](#table-of-contents)
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### sumPower
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Returns the sum of the powers of all the numbers from `start` to `end` (both inclusive).
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Use `Array.fill()` to create an array of all the numbers in the target range, `Array.map()` and the exponent operator (`**`) to raise them to `power` and `Array.reduce()` to add them together.
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Omit the second argument, `power`, to use a default power of `2`.
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Omit the third argument, `start`, to use a default starting value of `1`.
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```js
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const sumPower = (end, power = 2, start = 1) =>
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Array(end + 1 - start)
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.fill(0)
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.map((x, i) => (i + start) ** power)
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.reduce((a, b) => a + b, 0);
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```
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<details>
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<summary>Examples</summary>
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```js
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sumPower(10); // 385
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sumPower(10, 3); //3025
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sumPower(10, 3, 5); //2925
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```
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</details>
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<br>[⬆ Back to top](#table-of-contents)
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---
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## 📦 Node
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@ -4012,7 +4043,7 @@ words('python, javaScript & coffee'); // ["python", "javaScript", "coffee"]
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<br>[⬆ Back to top](#table-of-contents)
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---
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## 💎 Utility
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## 🔧 Utility
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### coalesce
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@ -4211,6 +4242,7 @@ Use the spread operator (`...`) to check if the provided argument is iterable in
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```js
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const isArrayLike = val =>
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try {return [...val], true; }
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catch (e) { return false; }
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@ -7,6 +7,7 @@ Use the spread operator (`...`) to check if the provided argument is iterable in
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```js
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const isArrayLike = val =>
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try {return [...val], true; }
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catch (e) { return false; }
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@ -8,7 +8,10 @@ Omit the third argument, `start`, to use a default starting value of `1`.
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```js
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const sumPower = (end, power = 2, start = 1) =>
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Array(end + 1 - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0)
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Array(end + 1 - start)
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.fill(0)
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.map((x, i) => (i + start) ** power)
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.reduce((a, b) => a + b, 0);
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```
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```js
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