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What is decrement (--) operator in JavaScript?
The decrement operator in Javascript decreases an integer value by one. This operator is often utilized in loops, counters, and mathematical computations where a value has to be decreased sequentially.
Types of Decrement Operators
The decrement operator (--) can be used in two ways ?
-
Post-decrement (x--): It provides the current value of the variable prior to its decrement.
- Pre-decrement (--x): It first decreases the value and then returns the variable's new value.
Syntax
x--; // Post-decrement --x; // Pre-decrement
Example
Below is an example where the value of a is pre-decremented twice using the decrement operator twice ?
<html>
<body>
<script>
var a = 33;
a = --a;
document.write("--a = ");
result = --a;
document.write(result);
</script>
</body>
</html>
Output
--a = 31
Example
Below is an example where the value of a is post-decremented twice using the decrement operator twice ?
<html>
<body>
<script>
var a = 33;
a = a--;
document.write("a-- = ");
result = a--;
document.write(result);
</script>
</body>
</html>
Output
a-- = 33
Conclusion
The decrement operator in JavaScript is the simplest means of reducing a variable by 1. Much of its extensive use is within loops, counters, and calculations. But remember that when post-decrementing, it doesn't change the value right away, which can be a bit tricky sometimes
Updated on: 2025-03-11T19:32:55+05:30
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