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To underscore the point that you don't need Lodash…
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//////// | |
// _.get | |
var object = { 'a': [{ 'b': { 'c': 3 } }] }; | |
_.get(object, 'a[0].b.c'); // => 3 | |
object?.a?.[0]?.b?.c; // => 3 | |
_.get(object, 'a.b.c', 'default'); // => 'default' | |
object?.a?.b?.c ?? 'default'; // => 'default' | |
///////// | |
// _.drop | |
_.drop([1, 2, 3]); // => [2, 3] | |
[1, 2, 3].slice(1); // => [2, 3] | |
_.drop([1, 2, 3], 2); // => [3] | |
[1, 2, 3].slice(2); // => [3] | |
_.drop([1, 2, 3], 5); // => [] | |
[1, 2, 3].slice(5); // => [] | |
_.drop([1, 2, 3], 0); // => [1, 2, 3] | |
[1, 2, 3].slice(0); // => [1, 2, 3] | |
///////// | |
// _.pick | |
var object = { 'a': 1, 'b': '2', 'c': 3 }; | |
_.pick(object, ['a', 'c']); // => { 'a': 1, 'c': 3 } | |
({a: object.a, c: object.c}); // => { 'a': 1, 'c': 3 } | |
(({a, c}) => ({a, c}))(object); // => { 'a': 1, 'c': 3 } | |
////////// | |
// _.curry | |
var abc = function(a, b, c) { return [a, b, c]; }; | |
var _curried = _.curry(abc); | |
var curried = a => b => c => abc(a, b, c) | |
_curried(1)(2)(3); // => [1, 2, 3] | |
curried(1)(2)(3); // => [1, 2, 3] | |
// These are harder to do; good luck remembering what the positional arguments refer to though. | |
_curried(1, 2)(3); // => [1, 2, 3] | |
_curried(1, 2, 3); // => [1, 2, 3] | |
_curried(1)(_, 3)(2); // => [1, 2, 3] | |
//////////// | |
// _.partial | |
function greet(greeting, name) { return greeting + ' ' + name; } | |
var sayHelloTo = _.partial(greet, 'hello'); sayHelloTo('fred'); // => 'hello fred' | |
var sayHelloTo = name => greet('hello', name); sayHelloTo('fred'); // => 'hello fred' | |
var greetFred = _.partial(greet, _, 'fred'); greetFred('hi'); // => 'hi fred' | |
var greetFred = greeting => greet(greeting, 'fred'); greetFred('hi'); // => 'hi fred' |
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https://youmightnotneed.com/lodash