Javascript - swap dictionary changes type to integer
So, I am using this code to invert a dictionary that I found on SO.
function g_swap_dictionary ( dict ) {
let ret = {};
for(var key in dict){
ret[dict[key]] = key;
}
return ret;
}
But if I have this dictionary:
[object Object] {
0: 0,
1: 2,
2: 4,
3: 1,
4: 3
}
and replace it, I get this:
[object Object] {
0: "0",
2: "1",
4: "2",
1: "3",
3: "4"
}
so the values change to string type. Since I want "g_swap_dictionary" to be as generic as possible, how can I fix this?
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1 answer
You can cast the value to a number with a unary plus+
ret[dict[key]] = +key;
// ^
function g_swap_dictionary (dict) {
let ret = {};
for(var key in dict){
ret[dict[key]] = +key;
}
return ret;
}
console.log(g_swap_dictionary({0: 0, 1: 2, 2: 4, 3: 1, 4: 3 }));
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