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## Abs
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### Instructions
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Create a `isPositive` function that takes a number as
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parameter and return true if the given number is
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stricly positive, or false otherwise
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Create the `abs` function that takes one number argument
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and returns its absolute value.
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You are not allowed to use `Math.abs`, make your own.
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### Notions
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- https://nan-academy.github.io/js-training/examples/functions.js
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- https://nan-academy.github.io/js-training/examples/ternary.js
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- https://devdocs.io/javascript/global_objects/math/abs
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### Code provided
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```js
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Math.abs = undefined
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```
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