React Native variable getting undefined before running method - react-native

Question

I have a function that calls a method that is in my Helper.js file.
import { getTest } from '../../common/Helper';
...
myMethod() {
...
const test = getTest(this.state.myID);
console.log(test);
}
...
My Helper.js:
export const getTest = (pID) => {
axios.get('http://myserver.com/', {
params: {
method: 'getVacantUnits',
propertyID: pID
}
}).then((response) => {
console.log(response.data);
return response.data;
}).catch((error) => {
// handle error
console.log(error);
return 0;
});
};
It is odd because my output is:
undefined
myDataContent
It looks like that "const test" is receiving undefined before the getTest being run. Why is it happening?
Thanks

Answer 1

It's returning this first since it's not awaiting the result:
console.log(test);
2 easy ways to fix this I am showing below, first with promise:
const test = getTest(this.state.myID).then(response=> console.log(response)).catch(err => console.log(err))
Add in return as well since you need to return from outermost function
export const getTest = (pID) => {
return axios.get('http://myserver.com/', {
params: {
method: 'getVacantUnits',
propertyID: pID
}
}).then((response) => {
console.log(response.data);
return response.data;
}).catch((error) => {
// handle error
console.log(error);
return 0;
});
};
second using async await:
// add in await
export const getTest = async (pID) => {
return axios.get('http://myserver.com/', {
params: {
method: 'getVacantUnits',
propertyID: pID
}
}).then((response) => {
console.log(response.data);
return response.data;
}).catch((error) => {
// handle error
console.log(error);
return 0;
});
};
// here you are awaiting the response before you run console.log
const test = await getTest(this.state.myID);
console.log(test);
You can solve this in several other ways, but I think these are the 2 easiest. Basically think about the fact that those are run synchronously and the console.log executes before the function returns, so if you "wait" then it makes it so the console.log() is dependent on the first function executing first.