Function thunkify

Create a new function that calls the provided fn with the given arguments. After the first call the return value will be cached and returned again, meaning you technically only need to pass the arguments the first time.

Time complexity: O(1)

Space complexity: O(1)

Example

function add(a, b) {
 return a + b;
}

const thunk = thunkify(add);

thunk(1, 2); // 3
thunk(3, 4); // 3
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