Recreate common functional array methods for objects.
This library currently supports
- forEach
- some
- every
- find
- findKey
- filter
- map
- mapKeys
- reduce
- reduceRight
All following examples return 25
.
Using the plain functions.
fn.reduce(
fn.map(
fn.filter({
a: 1,
b: 2,
c: 3,
d: 4,
e: 5,
f: 6
},
(v) => v % 2 == 0),
(v) => v * 2),
(sum, v) => v + sum, 1);
Using the chain function.
fn.chain({
a: 1,
b: 2,
c: 3,
d: 4,
e: 5,
f: 6
})
.filter(v => v % 2 == 0)
.map(v => v * 2)
.reduce((sum, v) => v + sum, 1)
.value();
Note: probably easier to use the chaining method, unless you have custom functions you want to use
Using the piping functions.
fn.open({
a: 1,
b: 2,
c: 3,
d: 4,
e: 5,
f: 6
})
.pipe(fn.filter, (v) => v % 2 == 0)
.pipe(fn.map, (v) => v * 2)
.pipe(fn.reduce, (sum, v) => v + sum, 1)
.close();
Only use this if you're certain you need it.
Casting to a collection object.
fn({
a: 1,
b: 2,
c: 3,
d: 4,
e: 5,
f: 6
})
.filter(v => v % 2 == 0)
.map(v => v * 2)
.reduce((sum, v) => v + sum, 1);
- Avoid calling
collect()
where possible, to prevent double-iterating - Improve typing for array/object callbacks, to better differentiate return type and callback types
- Improve typing for piping
- Re-implement acceptance of arrays in collections
- Add
array
describe section to all tests, for completeness
Author: Matthew Balmer
Email: [email protected]
Twitter: @mattbalmer
Website: http://mattbalmer.com
License: MIT