pryr: assign-delayed – R documentation

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assign-delayed

Create an delayed binding.

Infix form of delayedAssign which creates an delayed or lazy binding, which only evaluates the expression the first time it is used.

x %<d-% value

`x`	unquoted expression naming variable to create
`value`	unquoted expression to evaluate the first time `name` is accessed

x %<d-% (a + b)
a <- 10
b <- 100
x

Tools for Computing on the Language

v0.1.4

GPL-2

Authors

Hadley Wickham [aut, cre], R Core team [ctb] (Some code extracted from base R)

Initial release