#Rust 🦀 – How to find a variable data type 🤔

Hi !

Quick post today to share how to find a variable data type in Rust. As far as I understand, we can use several ways to do this. In example, we can use these 2 std functions:

    use std::any::type_name function
    use std::intrinsics::type_name

The full sample code below create 2 vectors with different data, and print the data type of the vector, and of some of the vector’ elements. This is the output:

   Compiling datatype01 v0.1.0 (C:\src\labs\RustLabs\datatype01)
    Finished dev [unoptimized + debuginfo] target(s) in 0.55s
     Running `target\debug\datatype01.exe`
alloc::vec::Vec<char>
char
i32

Sample Source Code

	/*
	Copyright (c) 2023
	Author : Bruno Capuano
	Create Time : 2023 Feb
	Change Log :
	– Demo to find variables data type

	The MIT License (MIT)
	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:
	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.
	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	THE SOFTWARE.
	*/

	fn main() {
	let v_char = vec!['A','c','e'];
	let v_num = vec![1,2];

	print_variable_type(&v_char);
	print_variable_type(&v_char[0]);
	print_variable_type(&v_num[0]);
	}

	fn print_variable_type<K>(_: &K) {
	println!("{}", std::any::type_name::<K>())
	}

view raw rustfinddatatype.rs hosted with ❤ by GitHub

Happy coding!

Greetings

El Bruno

#Rust 🦀 – How to find a variable data type 🤔

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