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How to map key/value pairs of a "map" in JavaScript:
var map = {"a": 1, "b": 2, "c": 3};
alert(JSON.stringify(map));
I need to get an mapper containing key/value pair on each iteration:
// ["a_1", "b_2", "c_3"]
map.map((key, value) => key + "_" + value);
385
of("key1", "a", "key2", "b", "key3", "c"); Stream the entry set of map2. Use that entry's key as the key to the result map. use that entry's value as the key to retrieve the value of map1.
To get its properties as key/value pairs, you can use Object. entries , which you can then apply map to: map = Object. entries(map).
Each key can only have one value. But the same value can occur more than once inside a Hash, while each key can occur only once.
To get value for a specific key in Map in JavaScript, call get() method on this Map and pass the specific key as argument. get() method returns the corresponding value for given key, if present. If the specified key is not present, then get() returns undefined.
This is not a Map object. It's just a regular object. So, use Object.entries and then use map on the key value pair:
const map = {"a": 1, "b": 2, "c": 3};
const mapped = Object.entries(map).map(([k,v]) => `${k}_${v}`);
console.log(mapped);Object.entries returns:
[["a",1],["b",2],["c",3]]
Then loop through each of those inner arrays and create the string using template literals
If you have a Map object, use Array.from(map) to get the entries of the map and use the second parameter of Array.from to go over each entry and create the desired string
Array.from(map, ([k,v]) => `${k}_${v}`)
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