Is there a standard functional name for this function? - node.js

Question

I'm sure this function is likely common ( or possibly achievable other ways ) but I'm not sure of what it'd be called. I'm thinking of a sliding window of a certain size :-
let slidingMap = (arr,size, f) => {
r = []
arr.reduce((acc, n) => {
let b = acc.concat(n);
if(b.length > size) {
b.shift();
}
if(b.length == size) {
r.push(f(b))
}
return b;
},[])
return r;
}
so given slidingMap([1,2,3,4,5,6], 2, b => b)
you'd get [ [ 1, 2 ], [ 2, 3 ], [ 3, 4 ], [ 4, 5 ], [ 5, 6 ] ]
and slidingMap([1,2,3,4,5,6], 3, b => b)
you'd get [ [ 1, 2, 3 ], [ 2, 3, 4 ], [ 3, 4, 5 ], [ 4, 5, 6 ] ]
or for calculating differences :-
slidingMap([1,2,3,7,5,6],2, b => b.reduceRight((a, n) => a? a-n : n))
you'd get [ 1, 1, 4, -2, 1 ]
or moving average :-
slidingMap([1,2,3,7,5,6],3, b => b.reduce((a, n) => a+n,0)/b.length)
you'd get [ 2, 4, 5, 6 ]
so, is there a commonly implemented function(s) that achieves this?
Update
Probablly better implemented as
let sliding = (arr,size) => {
r = []
arr.reduce((acc, n) => {
let b = acc.concat(n);
if(b.length > size) {
b.shift();
}
if(b.length == size) {
r.push(b)
}
return b;
},[])
return r;
}
then just use map
sliding([1,2,3,4,5],2).map(somefunc);
Or perhaps using zip and skip ( using lodash in this case )
let sliding = (arr, size) =>
_.zip(..._.range(size).map(i => arr.slice(i)))
.filter(a => !a.some(v => v == undefined))
only trick here is the zip will insert undefined when it has no match so they need to be filtered out.