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## Functools Collection of functional utilities for Rust. ```rust let xs = vec![1, 2, 3]; let ys = vec![4, 5, 6]; assert_eq!(vector::zip_with(xs, ys, |x, y| x + y), vec![5, 7, 9]); ``` ```rust let xs = vec![1, 3, 5, 7, 9]; let is_odd = |x| x % 2 != 0; assert_eq!(truth::all(&xs, is_odd), true) ```