keyWhereValueIs

Returns the first key in an object with a particular value (or null if none is found)

TypeScript

function keyWhereValueIs<T extends object>(obj: T, value: any): string | null

// Example:

const obj = {a: 1, b: 2, c: 3}

keyWhereValueIs(obj, 3) //=> "c"

keyWhereValueIs(obj,4) //=> null