Javascript mystery command -

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i new javascript , have work out program does. in 2 integers compared inequality: <<= don't know , can't find online tutorials tell me. finlay perry

it updates lvalue left-shifting value on right.

var = 1; <<= 2; // leftshift 2 bits,          // in effect multiplying 4, making 4   += 1; // more common (familiar?) example of kind of operator          // add 1, making 5

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