How to plot function with parameter in R -

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i plot function several times, each time changing parameter (a constant) in function. how can this?

fun1 <- function(x, b) abs(x^2 - b^2)

plot(fun1(b=0.1),-1, 1)

plot(fun1(b=0.2),-1, 1, add=true)

same approach generalized in for-loop:

  (b in c(0.1,0.2))curve(abs(x^2 - b^2),add=true,col='red')

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