Count the number of occurrences of a given value in a range

Описание: The provided code defines an Apps Script function called COUNT_VAL that counts the occurrences of a specific value within a given range. Let's break down the code step by step:
Initialize a variable count to keep track of the count of occurrences of the specified value within the range. Set it to 0 initially.
Split the range string into an array of values using the split method. The delimiter used for splitting is a comma (','), as specified by range.split(',').
Iterate over each element (v) in the arr array using the forEach method and a callback function.
Inside the callback function, the code checks if the current element (v) is equal to the specified value (val) after removing any leading or trailing whitespace from v using the trim method.
If the equality condition (val == v.trim()) is true, it means the current element matches the specified value. In this case, increment the count variable by 1.
After iterating over all the elements in the array, the function returns the final value of the count variable, representing the total count of occurrences of the specified value within the given range.
In summary, the COUNT_VAL function takes a range (a comma-separated string of values) and a target value (val). It iterates through the values in the range, counts the number of occurrences of the target value, and returns the count.
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