1 | var _curry2 =
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2 | /*#__PURE__*/
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3 | require("./internal/_curry2");
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4 |
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5 | var _dispatchable =
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6 | /*#__PURE__*/
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7 | require("./internal/_dispatchable");
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8 |
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9 | var _makeFlat =
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10 | /*#__PURE__*/
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11 | require("./internal/_makeFlat");
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12 |
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13 | var _xchain =
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14 | /*#__PURE__*/
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15 | require("./internal/_xchain");
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16 |
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17 | var map =
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18 | /*#__PURE__*/
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19 | require("./map");
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20 | /**
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21 | * `chain` maps a function over a list and concatenates the results. `chain`
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22 | * is also known as `flatMap` in some libraries.
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23 | *
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24 | * Dispatches to the `chain` method of the second argument, if present,
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25 | * according to the [FantasyLand Chain spec](https://github.com/fantasyland/fantasy-land#chain).
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26 | *
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27 | * If second argument is a function, `chain(f, g)(x)` is equivalent to `f(g(x), x)`.
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28 | *
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29 | * Acts as a transducer if a transformer is given in list position.
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30 | *
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31 | * @func
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32 | * @memberOf R
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33 | * @since v0.3.0
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34 | * @category List
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35 | * @sig Chain m => (a -> m b) -> m a -> m b
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36 | * @param {Function} fn The function to map with
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37 | * @param {Array} list The list to map over
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38 | * @return {Array} The result of flat-mapping `list` with `fn`
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39 | * @example
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40 | *
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41 | * const duplicate = n => [n, n];
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42 | * R.chain(duplicate, [1, 2, 3]); //=> [1, 1, 2, 2, 3, 3]
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43 | *
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44 | * R.chain(R.append, R.head)([1, 2, 3]); //=> [1, 2, 3, 1]
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45 | */
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46 |
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47 |
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48 | var chain =
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49 | /*#__PURE__*/
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50 | _curry2(
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51 | /*#__PURE__*/
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52 | _dispatchable(['fantasy-land/chain', 'chain'], _xchain, function chain(fn, monad) {
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53 | if (typeof monad === 'function') {
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54 | return function (x) {
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55 | return fn(monad(x))(x);
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56 | };
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57 | }
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58 |
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59 | return _makeFlat(false)(map(fn, monad));
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60 | }));
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61 |
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62 | module.exports = chain; |
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