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x/ramda/tryCatch.js

:ram: Practical functional Javascript
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import _arity from './internal/_arity';import _concat from './internal/_concat';import _curry2 from './internal/_curry2';
/** * `tryCatch` takes two functions, a `tryer` and a `catcher`. The returned * function evaluates the `tryer`; if it does not throw, it simply returns the * result. If the `tryer` *does* throw, the returned function evaluates the * `catcher` function and returns its result. Note that for effective * composition with this function, both the `tryer` and `catcher` functions * must return the same type of results. * * @func * @memberOf R * @since v0.20.0 * @category Function * @sig (...x -> a) -> ((e, ...x) -> a) -> (...x -> a) * @param {Function} tryer The function that may throw. * @param {Function} catcher The function that will be evaluated if `tryer` throws. * @return {Function} A new function that will catch exceptions and send then to the catcher. * @example * * R.tryCatch(R.prop('x'), R.F)({x: true}); //=> true * R.tryCatch(() => { throw 'foo'}, R.always('catched'))('bar') // => 'catched' * R.tryCatch(R.times(R.identity), R.always([]))('s') // => [] */var tryCatch = _curry2(function _tryCatch(tryer, catcher) { return _arity(tryer.length, function() { try { return tryer.apply(this, arguments); } catch (e) { return catcher.apply(this, _concat([e], arguments)); } });});export default tryCatch;