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Saturday, November 26, 2011

JSONH New schema Argument

The freaking fast and bandwidth saver JSONH Project has finally a new schema argument added at the end of every method in order to make nested Homogeneous Collections automatically "packable", here an example:

// nested objects b property
// have same homogeneous collections
// in properties c and d
schema = ["b.c", "b.d"],

// test case
test = [
{ // homogeneous collections in c and d
b: {
c: [
{a: 1},
{a: 2}
d: [
{a: 3},
{a: 4}
}, {
a: 1,
// same homogeneous collections in c and d
b: {
c: [
{a: 5},
{a: 6}
d: [
{a: 7},
{a: 8}

The JSONH.pack(test, schema) output will be the equivalent of this string:


How Schema Works

It does not matter if the output is an object or a list of objects, as well as it does not matter if the output has nested properties.
As soon as there is an homogeneous collection somewhere deep in the nested chain and common for all other levels, the schema is able to reach that property and optimize it directly.
Objects inside objects do not need to be the same or homogeneous, these can simply have a unique property which is common for all items and this is enough to take advantage of the schema argument that could be one string, or an array of strings.


Not because it does not work, I have added tests indeed, simply because I am not sure 100% this implementation covers all possible cases but I would rather keep it simple and let developers deal with more complex scenario via manual parsing through the JSONH.pack/unpack and without schema ... this is still possible as it has always been.
Let me know what you think about the schema, if accepted, I will implement it in Python and PHP too, thanks.

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