How to Declare Variables with Explicit Types in TypeScript ?
In TypeScript, you declare variables with explicit types by specifying the type of the variable after its name using a colon (:
) followed by the desired data type which can be string, number, etc.
Example 1: Here, the variable age
is explicitly declared with the type number
. This means it can only store numerical values, and TypeScript will enforce this type of constraint. If you try to assign a value of a different type to the variable, TypeScript will raise a type error during compilation.
// Declaring a variable with an explicit type
let age: number;
// Assigning a value to the variable
age = 25;
// Now, the variable 'age' can only hold numerical values
Example 2: you can also declare and initialize a variable in a single line.
// Declaring and initializing a variable with an explicit type
let name: string = "John";
// Now, the variable 'name' is of type string and holds the value "John"
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