collections

filter(fn, collection) → (Array or Object)

Filters an array/object based on the boolean evaluation of the passed function.

//Arrays
filter(x => x > 1, [1,2,3]) // -> [2,3]
//Objects
filter(x => x > 1, {a:1,b:2}) // -> {b:2}

See also

collectionsTest.js

Returns

(Array or Object) 

map(fn, collection) → (Array or Object)

Maps over an array/object applying the passed function

//Arrays
map(x => x+1, [1,2,3]) // -> [2,3,4]
//Objects
map(x => x+1, {a:1,b:2}) // -> {a:2,b:3}

See also

collectionsTest.js

Returns

(Array or Object) 

reduce(fn, init, collection) → any type

Reduces an array/object based on the reduction function and the initialization value passed

//Arrays
reduce((a,b)=> a+b,0,[1,2,3]) // -> 6
reduce((a,b)=> a.concat(b+1),[],[1,2,3]) // -> [2,3,4]
//Objects
reduce((a,v,k)=> ({..a,[k],v+1}),{},{a:1,b:2}) // -> {a:2,b:3}

See also

collectionsTest.js

Returns

any type