JavaScript Operator: plus assignment
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In JavaScript,
the += operator is
the assignment operator with addition (if arithmetic) or concatenation (if string).
Arithmetic operator
For example, if x is 5
and y is 8 then y += x
results in x remaining 5 and y
= y + x, so y becomes 13.
String operator
For example, if x is "a"
and y is "b" then y
+= x results in x
remaining "a" and y = y + x, so y becomes "ba".
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