LPOS - Upstash Documentation

await redis.rpush("key", "a", "b", "c"); 
const index = await redis.lpos("key", "b");
console.log(index); // 1

await redis.rpush("key", "a", "b", "c", "b"); 
const index = await redis.lpos("key", "b", { rank: 2 });
console.log(index); // 3

await redis.rpush("key", "a", "b", "b");
const positions = await redis.lpos("key", "b", { count: 2 });
console.log(positions); // [1, 2]

Arguments

string

required

The key of the list.

unknown

required

The element to match.

number

The rank of the element to match. If specified, the element at the given rank is matched instead of the first element.

number

The maximum number of elements to match. If specified, an array of elements is returned instead of a single element.

number

Limit the number of comparisons to perform.

The index of the matching element or an array of indexes if opts.count is specified.

await redis.rpush("key", "a", "b", "c"); 
const index = await redis.lpos("key", "b");
console.log(index); // 1

await redis.rpush("key", "a", "b", "c", "b"); 
const index = await redis.lpos("key", "b", { rank: 2 });
console.log(index); // 3

await redis.rpush("key", "a", "b", "b");
const positions = await redis.lpos("key", "b", { count: 2 });
console.log(positions); // [1, 2]