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leandromoreira/pure.js Secret

Created April 24, 2016 14:03
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pure.js
// impure - because you can change promo value (side effect)
// and for the same input X it can produce a different output.
var promo = 40
var isPromo = function(price) {return price === promo}
// pure
var isPromo = function(price) {return price === 40}
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