Prelude library defines const function
like below.
const x _ = x
Whatever the second argument, const
function always return the first argument of const function.
Example, We can implement length function
like below.
Prelude> let length = sum.map(const 1) Prelude> Prelude> length [] 0 Prelude> length [1, 2, 3] 3 Prelude> length "Hello World" 11
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