over: Map a function over a lens

Description Usage Arguments Examples

Description

Get the data pointed to by a lens, apply a function and replace it with the result.

Usage

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over(d, l, f)

Arguments

d

the data (or an oscope)

l

the lens (or the function if d is an oscope)

f

the function (or nothing if d is an oscope)

Examples

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third_l <- index(3)
over(1:5, third_l, function(x) x + 2)
# returns c(1:2, 5, 4:5)  

cfhammill/fresnel documentation built on May 15, 2019, 1:13 p.m.