How to use the findLastKey function from lodash
Find comprehensive JavaScript lodash.findLastKey code examples handpicked from public code repositorys.
lodash.findLastKey is a function in the Lodash library that returns the last key of an object for which a provided function returns a truthy value.
2802 2803 2804 2805 2806 2807 2808 2809 2810 2811* return chr.age < 40; * }); * // => returns `pebbles`, assuming `_.findKey` returns `barney` * * // using "_.where" callback shorthand * _.findLastKey(characters, { 'age': 40 }); * // => 'fred' * * // using "_.pluck" callback shorthand * _.findLastKey(characters, 'blocked');
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118 119 120 121 122 123 124 125 126 127module.exports.find = _.find; module.exports.findIndex = _.findIndex; module.exports.findKey = _.findKey; module.exports.findLast = _.findLast; module.exports.findLastIndex = _.findLastIndex; module.exports.findLastKey = _.findLastKey; module.exports.first = _.first; module.exports.firstExisting = _.firstExisting; module.exports.fix = _.fix; module.exports.flatMap = _.flatMap;
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How does lodash.findLastKey work?
lodash.findLastKey is a function in the Lodash library that iterates over the properties of an object from right to left and returns the first key that returns true for the provided predicate function. If none of the keys satisfy the predicate function, it returns undefined. Here is how it works in detail: It takes two arguments: the object to iterate over and the predicate function to be applied to each key. It iterates over the object from right to left. For each key in the object, it applies the predicate function to the value of the key. If the predicate function returns true, it returns the key and exits the loop. If none of the keys satisfy the predicate function, it returns undefined.
GitHub: mdmarufsarker/lodash
632 633 634 635 636 637 638 639 640 641 642 643 644console.log(extendWith); // => { 'a': 1, 'b': 2, 'c': 3 } const findKey = _.findKey({ 'a': 1, 'b': 2, 'c': 3 }, o => o === 2); console.log(findKey); // => 'b' const findLastKey = _.findLastKey({ 'a': 1, 'b': 2, 'c': 3 }, o => o === 2); console.log(findLastKey); // => 'b' const forIn = _.forIn({ 'a': 1, 'b': 2 }, (value, key) => console.log(key)); // => Logs 'a' then 'b'.
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GitHub: pappukrs/nodash-lib
499 500 501 502 503 504 505 506 507 508 509 510// }; // const filteredUsers = lodash.findKey(users, (ele) => ele.age == 1); // const filteredUsers = lodash.findKey(users, { age: 40, active: false }); // const filteredUsers = lodash.findKey(users, ["active", false]); // const filteredUsers = lodash.findLastKey(users, ["active", true]); // const filteredUsers = lodash.findLastKey(users, { active: true }); // console.log("filteredUsers", filteredUsers);
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Ai Example
1 2 3 4 5 6 7 8 9 10 11const _ = require("lodash"); const users = { user1: { name: "Alice", age: 25 }, user2: { name: "Bob", age: 30 }, user3: { name: "Charlie", age: 35 }, user4: { name: "David", age: 40 }, }; const key = _.findLastKey(users, (user) => (user.age = 30)); console.log(key); // Output: 'user4'
In this example, lodash.findLastKey is used to find the key of the last user in the users object whose age is greater than or equal to 30. The function takes two arguments: the first argument is the object to search through, and the second argument is a function that returns a boolean value indicating whether a given item matches the search criteria. In this case, the search function returns true if the user's age is greater than or equal to 30. The function returns the key of the last matching item, which in this case is 'user4'.
63 64 65 66 67 68 69 70 71 72var values = valueCounter(hand); //find the left pair var leftPair = _.findKey(values, _.curry(_.eq)(2)); //find the right pair var rightPair = _.findLastKey(values, _.curry(_.eq)(2)); if (leftPair && rightPair && leftPair !== rightPair) { //delete the pairs from our object delete values[leftPair]; delete values[rightPair];
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