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