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// não irã funcionar, leia abaixo a explicação. | |
const resultado = objeto | |
|> removeNullish | |
|> makeLowerCase | |
|> addId |
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const resultado = addId(makeLowerCase(removeNullish(objeto))); |
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const hasMoreCharactersThan = (desired) => (value) => { | |
const size = value?.length; | |
if(size < desired) { | |
throw new Error(`Value is not more than ${desired} characters`); | |
} | |
return value; | |
} | |
const isValidDescription = hasMoreCharactersThan(100); | |
const isValidEmail = hasMoreCharactersThan(10); |
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/** | |
* @nosideeffects | |
* @param obj {Object} | |
* @param props {string[]} | |
* @return {Object} | |
*/ | |
function makeLowerCase(obj, props) { | |
const _obj = { ...obj }; | |
for (let prop of props) { | |
_obj[prop] = obj[prop].toLowerCase(); |
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const pessoa = { | |
nome: 'mathias', | |
idade: 26, | |
profissoes: ['desenvolvedor', 'professor'], | |
} | |
const { profissoes } = pessoa; | |
const [ _, segundaProfissao ] = profissoes; | |
console.log(segundaProfissao); // professor |
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const pessoa = { | |
nome: 'mathias', | |
idade: 26, | |
profissoes: ['desenvolvedor', 'professor'], | |
} | |
const { profissoes } = pessoa; | |
const [ primeiraProfissao, segundaProfissao ] = profissoes; | |
console.log(primeiraProfissao); // desenvolvedor |
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function somar(...params) { | |
return params.reduce((acc, curr) => acc + curr, 0); | |
} |
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function _somar(a, b) { | |
return a + b; | |
} | |
function __somar(a, b, ...restante) { | |
return a + b; | |
} | |
function ___somar(...params) { | |
return params[0] + params[1]; |
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function somar(a, b) { | |
return a + b; | |
} | |
somar(2, 2, 2); |
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const atualizacao = { | |
nome: 'mathias', | |
} | |
const pessoa = { | |
nome: 'matias', | |
idade: 26, | |
...atualizacao, | |
} |
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