About
In this code snippet, we’ll learn how to check and convert data types in Javascript.
Let’s see the code example below.
Code:
//Check data types.////////////////////////////////////////////////// let var1 = "5"; let var2 = 5; let var3 = false; let var4 = { property: "I'm a property" }; //... checkDataType(var1); checkDataType(var2); checkDataType(var3); checkDataType(var4); function checkDataType(variable){ //Using typeof to checking the data type. switch(typeof variable){ case "string": console.log("It's a string!"); break; case "number": console.log("It's a number!"); break; case "boolean": console.log("It's a boolean!"); break; case "object": console.log("It's an object!"); break; case "function": console.log("It's a function!"); break; case "undefined": console.log("It's undefiend!"); break; } } ///////////////////////////////////////////////////////////////////// //Data type conversions.///////////////////////////////////////////// //Convert string to int. let intVar = parseInt("5"); //The Number() function does the same. //convert int to string. let stringVar = intVar.toString(); //The String() function does the same. //Convert string to float. let floatVar = parseFloat("5.5"); //The Number() function does the same. /////////////////////////////////////////////////////////////////////