Functions em Javascript
Some examples of SIMPLE functions that helped me practice:
function example 1:
n1 = 6; n2 = 5; function somar (n1,n2){ return n1+n2; } console.log(somar(n1,n2));
example function 2:
var cliente = { nome: "Joao da Silva", telefone:"08 99999990", idade: 19, cidade: "São Paulo" }; function imprimir(i){ console.log("Nome: "+i.nome); console.log("Telefone: "+i.telefone); console.log("Idade: ",i.idade); console.log("Cidade"+i.cidade); } console.log(cliente);
random examples:
function modificarObjeto(o) { if (o != null && typeof o == "object") { // Verifica se 'o' não é nulo e se é um objeto o.email = "jose@miranda.com"; // Adiciona ou atualiza a propriedade 'email' do objeto if (o.hasOwnProperty('idade')) { // Verifica se o objeto tem a propriedade 'idade' o.idade = 52; // Se a propriedade 'idade' existir, atualiza o valor para 52 } } }
more examples:
function modificarArray(a) { if (Array.isArray(a)) // Verifica se 'a' é um array a.push(1000, 2000, 3000); // Adiciona os valores 1000, 2000 e 3000 ao final do array }
more examples:
let numeros = [1 ,2 ,3]; console.log("Antes de chamar a função: ", numeros); function modificarArray(numeros) { if (Array.isArray(numeros)) // Verifica se 'a' é um array numeros.push(1000, 2000, 3000); // Adiciona os valores 1000, 2000 e 3000 ao final do array } modificarArray(numeros); console.log("Depois de chamar a função: ",numeros);
anonymous functions (Anonymous functions are unnamed functions used for quick tasks such as assigning to variables):
multiplicar = function (n1,n2){ return n1*n2 }; console.log("Resultado da multiplicacao = ",multiplicar(100,2));
more complex functions:
// Função que calcula o quadrado de um número function quadrado(n) { return n * n; // Retorna o quadrado de n } // Função que calcula o cubo de um número function cubo(n) { return n * n * n; // Retorna o cubo de n } // Função para mapear (aplicar) uma operação em todos os elementos de um array let mapearElementos = function(a, f) { if (Array.isArray(a)) { // Verifica se 'a' é um array for (let i = 0; i < a.length; i++) { // Itera sobre os elementos do array a[i] = f(a[i]); // Aplica a função 'f' em cada elemento de 'a' } } return a; // Retorna o array modificado }; // Array de números de 1 a 5 let v = [1, 2, 3, 4, 5]; // Usando mapearElementos para aplicar o quadrado a cada elemento console.log("Array ao quadrado:", mapearElementos(v, quadrado)); // Usando mapearElementos para aplicar o cubo a cada elemento console.log("Array ao cubo:", mapearElementos(v, cubo));
arrow function or arrow function:
let pessoa = { id: 1, nome: 'Joao', idade: 19 }; let imprimir = (o) => { console.log(); console.log('ID: ' + o.id); // Imprime o valor da propriedade 'id' do objeto console.log('Nome: ' + o.nome); // Imprime o valor da propriedade 'nome' do objeto console.log('Idade: ' + o.idade); // Imprime o valor da propriedade 'idade' do objeto console.log(); }; console.log(pessoa);
note: (it doesn't change anything from the other examples, just that it's an arrow)
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