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December 14, 2023 00:49
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Differences between .assignIn(), .assign, .merge(), defaults() and defaultsDeep()
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| // Tests with Lodash 4.16.4 | |
| // Thanks to http://stackoverflow.com/questions/19965844/lodash-difference-between-extend-assign-and-merge | |
| _.assignIn ({}, { a: 'a' }, { a: 'bb' }) // => { a: 'bb' } | |
| _.merge ({}, { a: 'a' }, { a: 'bb' }) // => { a: 'bb' } | |
| _.defaults ({}, { a: 'a' }, { a: 'bb' }) // => { a: 'a' } | |
| _.defaultsDeep({}, { a: 'a' }, { a: 'bb' }) // => { a: 'a' } | |
| --- | |
| _.assignIn ({}, { a: 'a' }, { a: undefined }) // => { a: undefined } | |
| _.merge ({}, { a: 'a' }, { a: undefined }) // => { a: 'a' } | |
| _.defaults ({}, { a: undefined }, { a: 'bb' }) // => { a: 'bb' } | |
| _.defaultsDeep({}, { a: undefined }, { a: 'bb' }) // => { a: 'bb' } | |
| --- | |
| _.assignIn ({}, {a:{a:'a'}}, {a:{b:'bb'}}) // => { a: { b: 'bb' } } | |
| _.merge ({}, {a:{a:'a'}}, {a:{b:'bb'}}) // => { a: { a: 'a', b: 'bb' } } | |
| _.defaults ({}, {a:{a:'a'}}, {a:{b:'bb'}}) // => { a: { a: 'a' } } | |
| _.defaultsDeep({}, {a:{a:'a'}}, {a:{b:'bb'}}) // => { a: { a: 'a', b: 'bb' } } | |
| --- | |
| _.assignIn ({}, {a:['a']}, {a:['bb']}) // => { a: [ 'bb' ] } | |
| _.merge ({}, {a:['a']}, {a:['bb']}) // => { a: [ 'bb' ] } | |
| _.defaults ({}, {a:['a']}, {a:['bb']}) // => { a: [ 'a' ] } | |
| _.defaultsDeep({}, {a:['a']}, {a:['bb']}) // => { a: [ 'a' ] } | |
| --- | |
| _.assignIn ([], ['a'], ['bb']) // => [ 'bb' ] | |
| _.merge ([], ['a'], ['bb']) // => [ 'bb' ] | |
| _.defaults ([], ['a'], ['bb']) // => [ 'a' ] | |
| _.defaultsDeep([], ['a'], ['bb']) // => [ 'a' ] | |
| _.assignIn ([], ['a','b'], ['bb']) // => [ 'bb', 'b' ] | |
| _.merge ([], ['a','b'], ['bb']) // => [ 'bb', 'b' ] | |
| _.defaults ([], ['a','b'], ['bb']) // => [ 'a', 'b' ] | |
| _.defaultsDeep([], ['a','b'], ['bb']) // => [ 'a', 'b' ] | |
| --- | |
| // _.assign vs _.assignIn | |
| function Foo() { | |
| this.a = 1; | |
| } | |
| function Bar() { | |
| this.c = 3; | |
| } | |
| Foo.prototype.b = 2; | |
| Bar.prototype.d = 4; | |
| _.assignIn({ 'a': 0 }, new Foo, new Bar); | |
| // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 } | |
| _.assign({ 'a': 0 }, new Foo, new Bar); | |
| // => { 'a': 1, 'c': 3 } |
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