1 | var _curry1 =
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2 | /*#__PURE__*/
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3 | require("./internal/_curry1");
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4 | /**
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5 | * Transposes the rows and columns of a 2D list.
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6 | * When passed a list of `n` lists of length `x`,
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7 | * returns a list of `x` lists of length `n`.
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8 | *
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9 | *
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10 | * @func
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11 | * @memberOf R
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12 | * @since v0.19.0
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13 | * @category List
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14 | * @sig [[a]] -> [[a]]
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15 | * @param {Array} list A 2D list
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16 | * @return {Array} A 2D list
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17 | * @example
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18 | *
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19 | * R.transpose([[1, 'a'], [2, 'b'], [3, 'c']]) //=> [[1, 2, 3], ['a', 'b', 'c']]
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20 | * R.transpose([[1, 2, 3], ['a', 'b', 'c']]) //=> [[1, 'a'], [2, 'b'], [3, 'c']]
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21 | *
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22 | * // If some of the rows are shorter than the following rows, their elements are skipped:
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23 | * R.transpose([[10, 11], [20], [], [30, 31, 32]]) //=> [[10, 20, 30], [11, 31], [32]]
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24 | * @symb R.transpose([[a], [b], [c]]) = [a, b, c]
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25 | * @symb R.transpose([[a, b], [c, d]]) = [[a, c], [b, d]]
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26 | * @symb R.transpose([[a, b], [c]]) = [[a, c], [b]]
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27 | */
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28 |
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29 |
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30 | var transpose =
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31 | /*#__PURE__*/
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32 | _curry1(function transpose(outerlist) {
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33 | var i = 0;
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34 | var result = [];
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35 |
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36 | while (i < outerlist.length) {
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37 | var innerlist = outerlist[i];
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38 | var j = 0;
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39 |
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40 | while (j < innerlist.length) {
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41 | if (typeof result[j] === 'undefined') {
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42 | result[j] = [];
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43 | }
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44 |
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45 | result[j].push(innerlist[j]);
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46 | j += 1;
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47 | }
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48 |
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49 | i += 1;
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50 | }
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51 |
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52 | return result;
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53 | });
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54 |
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55 | module.exports = transpose; |
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