Specifically, x += y is x = x + y which will allocate a new vector for x+y and assign that to x. x .+= y is x .= x .+ y which won’t allocate a vector, and will modify x.
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Specifically, x += y is x = x + y which will allocate a new vector for x+y and assign that to x. x .+= y is x .= x .+ y which won’t allocate a vector, and will modify x.