Syntax error Can someone explain to me what the plus sign is before the variables in JavaScript?

Can someone explain to me what the plus sign is before the variables in JavaScript?

The plus(+) sign before the variables defines that the variable you are going to use is a number variable.

In the below code, there is brief description about plus sign. Following is the code −

Example

var firstValue="1000";
console.log("The data type of firstValue ="+typeof firstValues);
var secondValue=1000;
console.log("The data type of secondValue ="+typeof secondValue);
console.log("The data type of firstValue when + sign is used ="+typeof
+firstValue);
var output=+firstValue + secondValue;
console.log("Addition is="+output);

To run the above program, you need to use the following command −

node fileName.js.

Output

Here, my file name is demo149.js. This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo149.js
The data type of firstValue =string
The data type of secondValue =number
The data type of firstValue when + sign is used =number
Addition is=2000
Updated on: 2020-09-11T08:28:48+05:30

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