Strongly vs. Weakly Typed Languages

Weakly typed: Make conversions between unrelated types implicitly

• C, JavaScript, Ruby, shell, PHP
• Example:

var = 21
var = var + "dot"
print(var)

Traceback (most recent call last): 
	File "main.py", line 2, in <module>
		var = var + "dot" #type-error, string and int cannot be concatenated.
TypeError: unsupported operand type(s) for +: 'int' and 'str'

Strongly typed: Make implicit conversions between types

• C, C++, C#, Java, Python, TypeScript
• Example:

value = 21;
value = value + "dot";
console.log(value);

21dot

See also: Statically vs. Dynamically Typed Languages