Foreach in Javascript

Question

Hello, I have an object in JavaScript and would like to check if all the values of the object keys are different from null, undefined, 0, "" and " ".

I traverse each value of my object through the forEach, but I want the first condition to be executed only if all values are different from what I commented above.

In my code, if only one value is no longer null, undefined, 0, "" or " ", my code performs the condition and does not enter Else anymore.

Beautified JavaScript:

let dados = {
    nome: nome,
    email: email,
    telefone: telefone,
    cursos: cursos,
    cidade: cidade
};
let condicao = false;
Object.values(dados).forEach(function (campo) {
    console.log(campo);
    if (campo !== "" && campo !== null && campo !== " " && campo !== false && campo !== 0 && campo !== undefined) {
        //Execute algo
    } else {
        if (condicao == false) {
            alert("Preencha todos os campos");
            condicao = true;
        }
    }
})

Someone can help me?

Answer 1

The object in JS is key-value.

You can use for...in, follow the documentation below

//Objeto
var obj = {a:1, b:2, c:3};

//Para prop (propriedade) in obj (objeto) faça
for (var prop in obj) {
  // ctrl+shift+k (para abrir o console no mozilla firefox)
  console.log("obj." + prop + " = " + obj[prop]);
}

//A saída (output) deverá ser:
// "obj.a = 1"
// "obj.b = 2"
// "obj.c = 3"

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Answer 2

out of a method, I imagine the resolution in a simple and verbose way as following:

let dados = { nome: '', email: 'email', telefone: 'telefone', cursos: 'cursos', cidade: 'cidade' };

let count = 0;

Object.values(dados).forEach(function (campo) {
    if (!campo || campo === ' ') {
        count++;
    }
});

if (count === 0) {
    console.log('todos preenchidos');
} else {
    console.log('falta preencher');
}

Just stick to a few details:

• In javascript, 0, null, Undefined and blank are values that return false, so in a check if you use "! var", for any of these values that is in the variable, will return false;
• You used "&&" for checking, in which case the value of a variable would have to be, according to your example, null, blank, Undefined, etc... and it is impossible for a value to have all these rsrs attributes, in which case you should use "||"therefore, if the value has any of these conditions, it will return false

I hope I helped, good luck.