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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| // Data source utils | ||
|
|
||
| /** | ||
| * Extracts unique values of a specified nested property from an array of JSON objects. | ||
| * | ||
| * @param {Array} data - An array of JSON objects from which to extract unique values. | ||
| * @param {string} key - The dot-separated key representing the nested property (e.g., 'source.id'). | ||
| * @returns {Array} An array containing the unique values of the specified nested property. | ||
| * | ||
| * @example | ||
| * const data = [ | ||
| * {"id": 1, "name": "foo", "source": {"id": 4, "name": "bar"}}, | ||
| * {"id": 2, "name": "baz", "source": {"id": 4, "name": "qux"}}, | ||
| * {"id": 3, "name": "quux", "source": {"id": 5, "name": "corge"}} | ||
| * ]; | ||
| * | ||
| * const key = 'source.id'; | ||
| * const uniqueSourceIds = getUniqueValues(data, key); | ||
| * console.log(uniqueSourceIds); // Output: [4, 5] | ||
| */ | ||
| export function getUniqueValues(data, key) { | ||
| var lookup = {}; | ||
| var items = data; | ||
| var results = []; | ||
|
|
||
| for (var item, i = 0; item = items[i++];) { | ||
| var val = getValueByNestedKey(item, key); | ||
|
|
||
| if (!(val in lookup)) { | ||
| lookup[val] = 1; | ||
| results.push(val); | ||
| } | ||
| } | ||
| return results; | ||
| } | ||
|
|
||
| /** | ||
| * Retrieves the value of a nested property in an object using a dot-separated key. | ||
| * | ||
| * @param {Object} obj - The input JavaScript object from which to retrieve the nested value. | ||
| * @param {string} key - The dot-separated key representing the nested property (e.g., 'source.id'). | ||
| * @returns {*} The value of the nested property if found, otherwise, returns undefined. | ||
| * | ||
| * @example | ||
| * const jsonString = '{"id":11,"name":"ajax","subject":"OR","mark":63,"source":{"id":4,"name":"foo"}}'; | ||
| * const jsonObject = JSON.parse(jsonString); | ||
| * | ||
| * const key = 'source.id'; | ||
| * const sourceId = getValueByNestedKey(jsonObject, key); | ||
| * console.log(sourceId); // Output: 4 | ||
| */ | ||
| function getValueByNestedKey(obj, key) { | ||
| const keys = key.split('.'); | ||
| let value = obj; | ||
| for (const k of keys) { | ||
| if (value[k] === undefined) { | ||
| return undefined; // Property not found | ||
| } | ||
| value = value[k]; | ||
| } | ||
| return value; | ||
| } | ||
|
|
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