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Introduction to JavaScript

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JavaScript and Type Conversion

JavaScript is a dynamic-type language:

We can assign any type of value to a variable. We can also change the type of a variable at any time and any position in the code. Let’s say we have assigned a string value to a variable, and then we want to change the type of that variable to a number.

let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);

              
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let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);
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Tehtävä

Swipe to start coding

A variable named totalDaysInMonth with the assigned string value of thirty has been given to you. Your task is to change the type of the variable from string to a number and display it on the console.

Ratkaisu

let totalDaysInMonth = "thirty";
totalDaysInMonth = 30;
console.log(totalDaysInMonth);

Summary:

  • The number datatype is for all kinds of numbers like integer or floating-point numbers.

  • The boolean variables can only have true or false as their values.

  • The typeof operator allows us to see the type of value stored in a variable.

  • JavaScript is a dynamic-type language, so we can change the type of data in it.

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Osio 3. Luku 3
let totalDaysInMonth = "thirty";

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