Adds the value of an expression to the value of a variable and assigns the result to the variable.
Syntaxresult += expression
var x = 5;
x += 2;
Using this operator is exactly the same as specifying: result = result + expression.
The types of the two expressions determine the behavior of the += operator.
If Then Both expressions are numeric or Boolean Add Both expressions are strings Concatenate One expression is numeric and the other is a string Concatenate See also Other articles AttributionsMicrosoft Developer Network: Article
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