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const clone = require('clone')
module.exports = getObjStructure
// This will create an object that represents the structure of the given object
// it replaces all values with the result of their type
// {
// "data": {
// "CurrencyController": {
// "conversionDate": "number",
// "conversionRate": "number",
// "currentCurrency": "string"
// }
// }
/**
* Creates an object that represents the structure of the given object. It replaces all values with the result of their
* type.
*
* @param {object} obj The object for which a 'structure' will be returned. Usually a plain object and not a class.
* @returns {object} The "mapped" version of a deep clone of the passed object, with each non-object property value
* replaced with the javascript type of that value.
*
*/
function getObjStructure (obj) {
const structure = clone(obj)
return deepMap(structure, (value) => {
return value === null ? 'null' : typeof value
})
}
/**
* Modifies all the properties and deeply nested of a passed object. Iterates recursively over all nested objects and
* their properties, and covers the entire depth of the object. At each property value which is not an object is modified.
*
* @param {object} target The object to modify
* @param {Function} visit The modifier to apply to each non-object property value
* @returns {object} The modified object
*/
function deepMap (target = {}, visit) {
Object.entries(target).forEach(([key, value]) => {
if (typeof value === 'object' && value !== null) {
target[key] = deepMap(value, visit)
} else {
target[key] = visit(value)
}
})
return target
}
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