8000 Add uniqByExisting function to handle missing property paths by vedant713 · Pull Request #5972 · lodash/lodash · GitHub
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Add uniqByExisting function to handle missing property paths #5972

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Add uniqByExisting function to handle missing property paths #5972

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48 changes: 46 additions & 2 deletions dist/lodash.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8454,8 +8454,52 @@
function uniq(array) {
return (array && array.length) ? baseUniq(array) : [];
}

/**
* This method is like `_.uniqBy` except that it skips elements where the
* specified property path doesn't exist. When using a property path string
* as the iteratee, objects that don't have that path will be excluded from
* the result entirely.
*
* @static
* @memberOf _
* @since 4.17.22
* @category Array
* @param {Array} array The array to inspect.
* @param {Function|string} [iteratee=_.identity] The iteratee invoked per element
* or the property path to check for existence.
* @returns {Array} Returns the new duplicate free array containing only objects
* where the property path exists.
* @example
*
* // With flat and nested objects
* var objects = [
* { name: 'Foo' },
* { name: 'Bar' },
* { person: { name: 'Foo' } },
* { person: { name: 'Bar' } }
* ];
*
* // uniqByExisting only includes objects where property path exists
* _.uniqByExisting(objects, 'person.name');
* // => [{ person: { name: 'Foo' } }, { person: { name: 'Bar' } }]
*/
function uniqByExisting(array, iteratee) {
if (!(array && array.length)) {
return [];
}

var func = getIteratee(iteratee, 2);
var isPropertyPath = typeof iteratee === 'string';

var filteredArray = isPropertyPath
? arrayFilter(array, function(value) {
return func(value) !== undefined;
})
: array;

return baseUniq(filteredArray, func);
}
/**
* This method is like `_.uniq` except that it accepts `iteratee` which is
* invoked for each element in `array` to generate the criterion by which
* uniqueness is computed. The order of result values is determined by the
Expand All @@ -8481,7 +8525,7 @@
function uniqBy(array, iteratee) {
return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
}

/**
* This method is like `_.uniq` except that it accepts `comparator` which
* is invoked to compare elements of `array`. The order of result values is
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