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## Using Reduce
### Instructions
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Create three functions :
- `adder` that receives an array and adds its elements.
- `sumOrMul` that receives an array and adds or multiplies its elements
depending on whether the element is an odd or an even number.
- `funcExec` that receives an array of functions and executes them.
All functions may or may not receive an extra argument that should be the
initial value for the functions execution.
Example:
```js
sumOrMul([1, 2, 3, 4], 5)
// -> (((5 + 1) * 2) + 3) * 4
// -> 60
````
#### Special instruction
The goal of this exercise is to learn to use `reduce`, as such all your
solution **MUST** use `reduce`
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### Notions
- [devdocs.io/javascript/global_objects/array/reduce](https://devdocs.io/javascript/global_objects/array/reduce)