Merge operator

Merge two objects from right to left.

x %<-% y

Arguments

x	A named list or vector
y	A named list or vector. Any duplicated names are detected in x will be covered by y

Value

a list

Examples

# two lists
x <- list(a = 1, b = "foo", c = 3)
y <- list(b = 2, d = 4)
x %<-% y
#> $a
#> [1] 1
#> 
#> $b
#> [1] 2
#> 
#> $c
#> [1] 3
#> 
#> $d
#> [1] 4
#> 
y %<-% x
#> $b
#> [1] "foo"
#> 
#> $d
#> [1] 4
#> 
#> $a
#> [1] 1
#> 
#> $c
#> [1] 3
#> 

# one list and one vector
x <- c(foo = 1, bar = 2)
y <- list(foo = "foo")
x %<-% y
#> $foo
#> [1] "foo"
#> 
#> $bar
#> [1] 2
#> 
y %<-% x
#> $foo
#> [1] 1
#> 
#> $bar
#> [1] 2
#> 

# two vectors
x <- c(a = 1, b = "foo", c = 3)
y <- c(b = 2, d = 4)
x %<-% y
#> $a
#> [1] "1"
#> 
#> $b
#> [1] 2
#> 
#> $c
#> [1] "3"
#> 
#> $d
#> [1] 4
#> 
y %<-% x
#> $b
#> [1] "foo"
#> 
#> $d
#> [1] 4
#> 
#> $a
#> [1] "1"
#> 
#> $c
#> [1] "3"
#> 

# duplicated names in x
x <- list(a = 1, b = "foo", b = 3)
y <- list(b = 2, d = 4)
x %<-% y
#> $a
#> [1] 1
#> 
#> $b
#> [1] 2
#> 
#> $d
#> [1] 4
#> 
y %<-% x # be careful, since "3" will cover on "foo" in x, then on "2" in y
#> $b
#> [1] 3
#> 
#> $d
#> [1] 4
#> 
#> $a
#> [1] 1
#>