The increment operator (
++) increments (adds one to) its operand and
returns a value.
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Operator: x++ or ++x
If used postfix, with operator after operand (for example,
x++), the increment operator increments and returns the value
If used prefix, with operator before operand (for example,
++x), the increment operator increments and returns the value
let x = 3; y = x++; // y = 3 // x = 4
let a = 2; b = ++a; // a = 3 // b = 3
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