javascript - Difference between test expressions -


i'm implementing obligatory slider in project. , following code worked fine:

else if( current - 1 === sliderlength ){   current = 1;   loc = 0 }

but didn't work expected:

else if( current === sliderlength - 1 ){   current = 1;   loc = 0 }

so, difference between current === sliderlength - 1 , current - 1 === sliderlength ?

i rename variable x , y brevity, , include pertinent part:

if (x - 1 === y) vs if (x === y - 1)

if have hard time seeing difference, try them both out random values x , y. let's try x = 3, y = 2

so, first 1 becomes:

if (3 - 1 === 2), or if ((3 - 1) === 2), or if (2 === 2) (i.e. true)

second 1 becomes:

if (3 === 2 - 1), or if (3 === (2 - 1)), or if (3 === 1) (i.e. false)

the important thing note comparison operation (===) happens after subtraction operation. that's not important in case, note.


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