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michaelficarra/set.prototype.map.js

Last active August 29, 2015 14:10
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ES6 Set.prototype.map issue
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set.prototype.map.js
var set = new Set([0, 1]),
f = function(x) { return 1 / x; },
g = function(x) { return x ? -0 : x; };
set.map(g); // Set{0}
set.map(g).map(f); // Set{1/0}
set.map(function(x){ return f(g(x)); }); // Set{1/0, -1/0}
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