Return the lowest index at which a value (second argument) should be inserted into an array (first argument) once it has been sorted.

For example, `getIndexToIns([1,2,3,4], 1.5)`

should return `1`

because it is greater than `1`

(index 0), but less than `2`

(index 1).

Likewise, `getIndexToIns([20,3,5], 19)`

should return `2`

because once the array has been sorted it will look like `[3,5,20]`

and `19`

is less than `20`

(index 2) and greater than `5`

(index 1).

Remember to use Read-Search-Ask if you get stuck. Write your own code.

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