Syntax, Parameter and Return Value
Syntax:
_.forOwnRight(object, [iteratee=_.identity])
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Parameters:
-
object (Object): The object to iterate over.
- [iteratee=_.identity] (Function): The function invoked per iteration.
Return Value:
Returns the passed-in object.
Examples
Reverse Iteration Over Object Properties:
JavaScript
var _ = require('lodash');
var user = { 'name': 'John', 'age': 30, 'active': true };
_.forOwnRight(user, function(value, key) {
console.log(key, value);
});
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// Possible Output: 'active' true, 'age' 30, 'name' John
Demonstrates iterating over an object's own properties in reverse order.
Modifying Properties During Reverse Iteration:
JavaScript
var data = { 'a': 1, 'b': 2, 'c': 3 };
_.forOwnRight(data, function(value, key) {
data[key] = value * 3;
});
console.log(data);
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Output:
{ 'a': 3, 'b': 6, 'c': 9 }
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Shows how to modify each property's value during reverse iteration.
Collecting Keys in Reverse Order:
JavaScript
var keys = [];
_.forOwnRight(user, function(value, key) {
keys.push(key);
});
console.log(keys);
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Possible Output:
['active', 'age', 'name']
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An example of collecting an object's keys in reverse order.
Breaking Out of the Iteration:
var object = { 'a': 1, 'b': 2, 'c': 3 };
_.forOwnRight(object, function(value, key) {
if (value === 2) {
return false; // Break out of the iteration
}
});
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Demonstrates stopping the reverse iteration based on a condition.
Frequently Asked Questions
How does _.forOwnRight() differ from _.forOwn()?
_.forOwn() iterates over an object's properties in the order they were added, while _.forOwnRight() does so in reverse.
Can _.forOwnRight() be used with arrays?
While _.forOwnRight() can technically be used with arrays, it is primarily designed for objects. For arrays, methods like _.forEachRight() are more appropriate.
Is it safe to modify the object being iterated over?
Modifying the object during iteration can lead to unexpected behavior, so it's generally advisable to avoid directly modifying the object's structure (like adding or removing properties) during iteration.
Conclusion
Lodash's _.forOwnRight() method provides a useful way to iterate over an object's own properties in reverse order. It's particularly valuable in scenarios where the order of property processing is significant, such as handling recent changes or applying overrides in a specific sequence.
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