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

​
Arguments

​
key
string
required

The key of the list.

​
element
unknown
required

The element to match.

​
opts
​
rank
number

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

​
count
number

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

​
maxLen
number

Limit the number of comparisons to perform.

​
Response

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

​
Arguments

​
key
string
required

The key of the list.

​
element
unknown
required

The element to match.

​
opts
​
rank
number

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

​
count
number

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

​
maxLen
number

Limit the number of comparisons to perform.

​
Response

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