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Merge pull request #193 from emarukyan/master

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fix contract function type in comments
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hemanth.hm 2019-02-06 19:19:08 +05:30 committed by GitHub
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@ -343,16 +343,16 @@ const predicate = (a) => a > 2
A contract specifies the obligations and guarantees of the behavior from a function or expression at runtime. This acts as a set of rules that are expected from the input and output of a function or expression, and errors are generally reported whenever a contract is violated. A contract specifies the obligations and guarantees of the behavior from a function or expression at runtime. This acts as a set of rules that are expected from the input and output of a function or expression, and errors are generally reported whenever a contract is violated.
```js ```js
// Define our contract : int -> int // Define our contract : int -> boolean
const contract = (input) => { const contract = (input) => {
if (typeof input === 'number') return true if (typeof input === 'number') return true
throw new Error('Contract violated: expected int -> int') throw new Error('Contract violated: expected int -> boolean')
} }
const addOne = (num) => contract(num) && num + 1 const addOne = (num) => contract(num) && num + 1
addOne(2) // 3 addOne(2) // 3
addOne('some string') // Contract violated: expected int -> int addOne('some string') // Contract violated: expected int -> boolean
``` ```
## Category ## Category