请问R语言ggplot2包中%||%是什么意思？

1. ggplot2::GeomRaster$setup_data
   
2. 
   
3. <ggproto method>
   
4.   <Wrapper function>
   
5.     function (...)
   
6. f(...)
   
7. 
   
8.   <Inner function (f)>
   
9.     function (data, params)
   
10. {
    
11.     hjust <- params$hjust %||% 0.5
    
12.     vjust <- params$vjust %||% 0.5
    
13.     w <- resolution(data$x, FALSE)
    
14.     h <- resolution(data$y, FALSE)
    
15.     data$xmin <- data$x - w * (1 - hjust)
    
16.     data$xmax <- data$x + w * hjust
    
17.     data$ymin <- data$y - h * (1 - vjust)
    
18.     data$ymax <- data$y + h * vjust
    
19.     data
    
20. }

复制代码

rlang::`%||%`
function (x, y)
{
    if (is_null(x))
        y
    else x
}

This infix function makes it easy to replace NULLs with a default value. It's inspired by the way that Ruby's or operation (||) works.

eg.
1 %||% 2
##[1] 1

NULL %||% 2
##[1] 2

cheetahfly 发表于 2019-4-18 21:39
This infix function makes it easy to replace NULLs with a default value. It's inspired by the way th ...

但为什么显示“ 没有"%||%"这个函数”呢

cheetahfly 发表于 2019-4-18 11:55
rlang::`%||%`
function (x, y)
{

谢谢，学习了！