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Showing content from https://webplatform.github.io/docs/javascript/operators/increment_and_decrement below:

increment and decrement · WebPlatform Docs

The increment operator increments, and the decrement operator decrements, the value of a variable by one.

result = ++ variable

result = -- variable

result = variable ++

result = variable --

result

Any variable.

variable

Any variable.

See Remarks.

var k = 5;
var j;
j = ++k; 
j = k++; 

If the operator appears before the variable, the value is modified before the expression is evaluated. If the operator appears after the variable, the value is modified after the expression is evaluated. In other words, given j = ++k; , the value of j is the original value of k plus one; given j = k++; , the value of j is the original value of k , which is incremented after its value is assigned to j.

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