searchsortedfirst

searchsortedfirst(a, x, [by=,] [lt=,] [rev=false])

Returns the index of the first value in `a` greater than or equal to `x`, according to the specified order. Returns `length(a)+1` if `x` is greater than all values in `a`.

Examples

``````# Search for the index of the first value greater than or equal to x

julia> arr = [1, 2, 3, 4, 5];
julia> searchsortedfirst(arr, 3)
3

# Search for the index using a custom ordering function

julia> arr = ["apple", "banana", "cherry", "date"];
julia> searchsortedfirst(arr, "c", lt=bylength)
2

# Reverse search in a sorted array

julia> arr = [5, 4, 3, 2, 1];
julia> searchsortedfirst(arr, 3, rev=true)
3

# Handling values greater than all elements

julia> arr = [10, 20, 30, 40, 50];
julia> searchsortedfirst(arr, 60)
6``````

Common mistake example:

``````julia> arr = [1, 2, 3, 4, 5];
julia> searchsortedfirst(arr, 6)
6``````

In this example, `6` is greater than all values in the array `arr`, so `length(arr)+1` is returned. It's important to handle the case where `x` is greater than all elements in `a` to avoid unexpected behavior.