I have the following code and I am trying to prevent the calculation inside of complexFunction in case same arguments are passed.
const complexFunction = (arg1, arg2) => {
/* complex calculation in here */
console.log('complexFunction');
return true;
};
// this is the method we need to implement
const memo=()=>{
}
const memoComplex = memo(complexFunction);
memoComplex(1, 2); // complex function should be executed
memoComplex(1, 2); // complex function should not be invoked again, instead the cached result should be returned
memoComplex(1, 3); // complex function should be executed
You can simply use an array of objects which holds the arguments to check if they've been used before, the code below demonstrates the use
const usedArgs = [];
const memoComplex = (arg1, arg2) => {
/* complex calculation in here */
const value = arg1 + arg2;
usedArgs.push({ arg1: arg1, arg2: arg2, data: value });
return value;
};
const memo = (arg1, arg2) => {
const exists = usedArgs.find(x => x.arg1 == arg1 && x.arg2 == arg2);
if (exists) {
console.log('loading from cache')
return exists.data;
} else return memoComplex(arg1, arg2);
}
console.log(memo(1, 2)); // complex function should be executed
console.log(memo(1, 2)); // complex function should not be invoked again, instead the cached result should be returned
console.log(memo(1, 3)); // complex function should be executedYou could save the arguments passed and the result in Session Storage and on method call, look if you have already saved that in the storage, if that the case you could get it and return the result. Otherwise you would execute your method as always
sessionStorage.setItem('clé', 'valeur');
const complexFunction = (arg1, arg2) => {
// Get item return null if not found
let potentialResult = sessionStorage.getItem("#1" + arg1.toString() + "#2" + arg2.toString());
if(potentialResult !== null) {
// If we have a result in session storage, that mean we have already done the calc
// so we return the result
return potentialResult;
} else {
// If we don't have a result, we just execute the function and save the result
/* complex calculation in here */
let result = "Your result"; // Assuming result is the result of your function
// We save the result to avoid future calculation
sessionStorage.setItem("#1" + arg1.toString() + "#2" + arg2.toString(), result);
console.log('complexFunction');
return true;
}
};
But as said in the comments, this is more a hint than a solution, so please adapt it to your use case