Find documents in a specific collection or a view. We can retrieve multiple documents from a collection(or view), based on some filters. This command returns a cursor, we can iterate over the items using the cursor.
Get the longitude and latitude of specific members from a geospatial index. Multiple members are allowed in the same command, so we can get the position of multiple members at the same time as an array.
Get the geohash string for one or more geo index members. We can add some members(longitude, latitude, member_name) to a geoindex using “GEOADD” command, then we can get the geohash of those members using this GEOHASH command.
Here is how to set up a connection from your preferred programming language. We have discussed the setup for NodeJS, Golang here.
Append one or more elements to the list. The element is added to the tail/right of the list, that’s why this command is named RPUSH(R+PUSH). Items are inserted to the right one by one. If multiple elements are provided to the command, then the first item is pushed to the right, then the next ones.
Here is the rule of thumb for variables passed by value vs reference- all primitive type variables(Number, String, Boolean, Symbol, etc.) are passed by value and all non-primitive type variables(object, array, etc.) are passed by reference.
Get the distance between 2 members/items saved in geospatial index. Geospatial information is saved in a sorted set data structure, when added with GEOADD command. This GEODIST command helps us to get the distance between 2 members saved in the geoindex.
Add one or more geospatial items/members to a geospatial index. If the
Remove one or more items/members from a set. If the member is not present in the set, then then it is ignored. If the
Hoisting deals with variables or function usage before its definition. Hoisting happens for the variables defined with “var”. For the variables defined with “let” or constants defined with “const”, hoisting will not happen. Hoisting happens for both variables and functions.