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January 2, 2020 17:02
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js examples
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| /* ... -> SPREAD OPERATOR */ | |
| [ ...[ 1, 3 ], 3, 4 ] | |
| /* create array with concat of array and items, result: [ 1, 3, 3, 4 ] */ | |
| [ ...[ 1, 2 ], ...[ 3 ] ] | |
| /* create array with literal concat of two arrays, result: [ 1, 2, 3 ] */ | |
| [ ...[ 1 ] ] | |
| /* copy array, result: [ 1 ] */ | |
| { ...{ teste: 'teste' }, ...{ teste1: 'teste1' }} | |
| /* create object with assign of two, result: { teste: 'teste', teste1: 'teste1' } | |
| it works like: Object.assign({}, { teste: 'teste' }, { teste1: 'teste1' }) */ | |
| { ...{ teste: 'teste' }} | |
| /* clone object, result: { teste: 'teste' } */ | |
| [ ...'teste' ] | |
| /* split string, it works like: 'teste'.split('') | |
| result: [ 't', 'e', 's', 't', 'e' ] */ | |
| const testFunction = (foo, bar) => { console.log({ foo }); console.log({ bar })} | |
| const a = [1, 2] | |
| testFunction(...a) | |
| /* split all items of array to parameters for a function, result: { foo: 1 } { bar: 2 } */ | |
| /*****************************/ | |
| /* ... -> REST OPERATOR - Example 1 */ | |
| const numbers = [1, 2, 3, 4, 5] | |
| [ first, second, ...others ] = numbers | |
| first // 1 | |
| second // 2 | |
| others // [ 3, 4, 5 ] | |
| /* ... -> REST OPERATOR - Example 2 */ | |
| const { first, second, ...others } = { | |
| first: 1, | |
| second: 2, | |
| third: 3, | |
| fourth: 4, | |
| fifth: 5 | |
| } | |
| first // 1 | |
| second // 2 | |
| others // { third: 3, fourth: 4, fifth: 5 } |
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