use-previous

About

Access the previous value of a variable with this React hook

Installation

npm install --save @rooks/use-previous

Importing the hook

import usePrevious from "@rooks/use-previous";

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

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