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35 lines
1.3 KiB
35 lines
1.3 KiB
var _arity = require('./internal/_arity');
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var _concat = require('./internal/_concat');
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var _curry2 = require('./internal/_curry2');
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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(R.prop('x'), R.F)(null); //=> false
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*/
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module.exports = _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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