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dddenis
Asked: 2020-02-11 02:53:59 +0800 CST 2020-02-11 02:53:59 +0800 CST

Map in JavaScript, traverse, get keys and values

  • 772

I have created a Map that has a string as key and an array of strings as value .

var miMapa = new Map();
miMapa.set("clave1", new Array("valor_a_1", "valor_a_2", "valor_a_3"));
miMapa.set("clave2", new Array("valor_b_1", "valor_b_2", "valor_b_3"));
miMapa.set("clave3", new Array("valor_c_1", "valor_c_2", "valor_c_3"));

I've tried looping through it like this: (i is fixed) (they share the same keys)

var keys = Object.keys(miMapa);
for (var n = 0; n < keys.length; n++) {
    otroMapa.get(keys[n]).innerHTML = miMapa.get(keys[n])[i]; 
}

But it doesn't work. How do you loop through a Map in JavaScript, how do you get its key, and how do you get the value having its key?

javascript

1 Answers

  1. Best Answer

    If you look at the documentationMap

    Map Reference

    you will see that you can perform a for

    for (var [key, value] of miMapa) {
  alert(key + " = " + value);
}

    In your case valueit is an array so you should do one formore to iterate through those values

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