How can I save multiple values to sessionStorage and display them?

Question

I want to have a calculation history on a calculator, but I just can't seem to get it working. I tried using sessionStorage.setItem("entries", JSON.stringify(this.entries)); but all it ever did was rewrite previous values. How can i save multiple values to sessionStorage and display them all?

https://jsfiddle.net/1bjxzamu/1/

Answer 1

You need to get previous value and update with new value then save it.

const saveData = (newEntry) => {
  let entries = sessionStorage.getItem("entries") || []
  entries.push(newEntry)
  sessionStorage.setItem("entries", JSON.stringify(entries))
}
saveData(["test"])