Given 2 integer, return their multiplication without using the multiplication operator

Question

Anoniem · Accepted Answer

Recursion. Manipulate only one of the two integers, let’s say y. If y is 0 then return 0. If y is greater than 0, call the same function with y-1 and return the sum of its result and x. Do not forget the case where y is negative (call the function with -y, and return the opposite)

Anoniem · Answer

function(a,b) {
    return (a << floor(log2(b))) + b%2==0?0:b;
}

Anoniem · Answer

Bit manipulation

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