This code defines a method (`getPrice`) on an object called...

This code defines a method (getPrice) on an object called ExternalInterface inside the app object. Here's a breakdown of what the code does step by step:

1. Purpose: The getPrice method is designed to find and return a value from a nested data object (data) based on specified length and width parameters.

2. Parameters:

   • data: A nested object where keys represent lengths and their corresponding values are inner objects whose keys represent widths.
   • length: The target length that needs to be searched or rounded up to the nearest available key in the data object.
   • width: The target width that needs to be searched or rounded up to the nearest available key in the inner object of data.

3. Workflow:

   • Extract all the keys of the data object and interpret them as numbers (using Object.keys(data).map(Number)). These represent available lengths.
   • The lengths array is sorted in ascending order using .sort((a, b) => a - b).
   • Find the smallest length in the lengths array that is greater than or equal to the input length using .find(l => l >= length). This is the targetLength.
     • If no such length exists (i.e., all lengths are smaller than the input length), return null.
   • Extract all the keys of the data[targetLength] object and interpret them as numbers (these represent available widths for the matching length).
   • The widths array is sorted in ascending order using .sort((a, b) => a - b).
   • Find the smallest width in the widths array that is greater than or equal to the input width using .find(w => w >= width). This is the targetWidth.
     • If no such width exists (i.e., all widths are smaller than the input width), return null.
   • Finally, if both targetLength and targetWidth are found, return data[targetLength][targetWidth]. This value is presumably some "price" or another value related to the given length and width.

4. Edge Cases:

   • If the data object is empty or doesn't contain suitable keys for length and width, the function returns null.
   • If the inputs (length or width) are very large and exceed all keys in data, null is returned.

Example Use Case:

Suppose data looks like this:

const data = {
    10: { 20: 100, 30: 150 },  // length 10 has widths 20 and 30 with corresponding prices 100 and 150
    15: { 20: 120, 40: 200 }   // length 15 has widths 20 and 40 with corresponding prices 120 and 200
};

Calling app.ExternalInterface.getPrice(data, 12, 25) would:

1. Find the smallest length ≥ 12: 15 (from [10, 15]).
2. Within data[15], find the smallest width ≥ 25: 40 (from [20, 40]).
3. Return data[15][40], which is 200.

If no valid length or width exists, it returns null.