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