usePrevious

About

Access the previous value of a variable with this React hook

Installation

npm install --save rooks

Importing the hook

import { usePrevious } from "rooks";

Usage

function Demo() {
  const myInput = useInput("hello world");
  const previousValue = usePrevious(myInput.value);
  return (
    <div>
      <div>
        <input {...myInput} />
      </div>
      <p>
        Current value is <b>{myInput.value}</b>
      </p>
      <p>
        Previous value was <b>{previousValue || "-"}</b>
      </p>
    </div>
  );
}

render(<Demo />);

Arguments

Argument	Type	Description
value	any	The variable whose previous value should be stored

Gif

Codesandbox Example

Basic Usage

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