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ViewsCopying data of one array with transformation into another array in javascript/react
My API is returning below output.
[
"ANT",
"ARG",
"ARM",
"BUR",
"UAE"
]
in my array I need to store countryname corresponding to these countrycode.
so for that I have used country-data library in react.
so I can get output like console.log(countries["UAE"].name);
I need to store country name in my countryData array which is declared below.
my react code is.
this.state = {
countryData: [],
};
I am using arraycode like below.
updateDropdownData() {
axios.get(`http://localhost:8080/country_code`).then((res) => {
res.data.map((code) => {
alert(countries[code].name);
countryData.push.apply(countryData, countries[code].name);
});
this.setState({ countryData });
});
}
but I am getting error
index.bundle.js:122 Uncaught (in promise) ReferenceError: countryData is not defined
at index.bundle.js:122:217123
at Array.map (<anonymous>)
what mistake I am doing. I am quite new in javascript and react.
Edit1:-
alert(countries[res.data[0]].name); //this line is working.
but const _countryData = res.data.map((code) => countries[code].name); giving error.
1 answers
Answer question0
Changing the state value directly does not fit React's method.
updateDropdownData() {
axios.get(`http://localhost:8080/country_code`).then((res) => {
const _countryData = res.data.map((code) => countries[code].name )
this.setState({ countryData: _countryData });
});
}
EDIT
The
countriesvariable must be where you run it. And the shape of the variable should be as follows.
const countries = {
"ANT" : { name : "ant_name" },
"ARG" : { name : "arg_name" },
...
}