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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
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