Suppose I have the following object:
var pessoa = {
nome: "João",
animais: {
cachorro: "Rex",
gato: "Pipoca",
}
}
I need a function to do something like this:
var gatoDoJoao = pessoa["animais.gato"];
I know that in this example the correct is pessoa.animais.gato , but I want the value to be accessed through a string.
Something like: var gatoDoJoao = acessar(pessoa, "animais.gato");
I finally got it resolved!
var obj = {
nome: "João",
animais: {
gato: "Foo",
cachorro: "Bar"
}
};
function acessar(obj, prop){
var tmp = obj;
var campos = prop.split(".");
for(var i in campos){
if(tmp.hasOwnProperty(campos[i])){
tmp = tmp[campos[i]];
}else{
return false;
}
}
return tmp;
}
var nomeDoGato = acessar(obj, "animais.gato");
console.log(nomeDoGato);
You see that property names are just texts as keys of an associative array .
They are different properties at different levels, so they should be accessed as different keys.
var pessoa = {
nome: "João",
animais: {
cachorro: "Rex",
gato: "Pipoca",
}
}
console.log(pessoa["animais"]["gato"]);It has a slightly easier way;
eval('pessoa.animais.gato');
The argument to the eval () function is a string. If the string represents a expression, eval () evaluates the expression. If the argument represents one or more JavaScript declarations, eval () evaluates the declarations. Not call eval () to evaluate an arithmetic expression; JavaScript evaluates arithmetic expressions automatically.