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I came across a program which I have written in a simplified form.

For[i=1,i<100, i=i+1;
func = a x^i;
func=.
];

What is purpose of "func=."?

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    $\begingroup$ A tip: whenever you encounter an unfamiliar symbol like =. in Mathematica, highlight it and press F1. $\endgroup$ – J. M.'s technical difficulties Mar 28 '18 at 17:29
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    $\begingroup$ =. removes any rules defined for the left-hand-side. $\endgroup$ – David G. Stork Mar 28 '18 at 17:54
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    $\begingroup$ Unset. $\endgroup$ – AccidentalFourierTransform Mar 28 '18 at 23:33
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=. removes any rules defined for the left-hand side.

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