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Pre,Post Increment,Decrement

++ and --, when placed in front of a variable, causes the value of the variable to be incremented by 1 and decremented by 1 respectively before the expression is evaluated. Placing them at the back of the variable causes the increment/decrement operation to be carried out after the evaluation. Individually, v++ is identical to v = v+1.


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<!DOCTYPE html><html><body><script>


   var n=0;
   console.log(n++); // 0
   console.log(n++); // 1
   console.log(n++); // 2
   console.log(++n); // 4
   console.log(++n); // 5
   console.log(++n); // 6
   console.log(n--*3); // 18
   console.log(--n*3); // 12

</script></body><html>