1 | var _curry3 =
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2 | /*#__PURE__*/
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3 | require("./internal/_curry3");
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4 | /**
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5 | * Scan is similar to [`reduce`](#reduce), but returns a list of successively
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6 | * reduced values from the left
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7 | *
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8 | * @func
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9 | * @memberOf R
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10 | * @since v0.10.0
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11 | * @category List
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12 | * @sig ((a, b) -> a) -> a -> [b] -> [a]
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13 | * @param {Function} fn The iterator function. Receives two values, the accumulator and the
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14 | * current element from the array
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15 | * @param {*} acc The accumulator value.
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16 | * @param {Array} list The list to iterate over.
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17 | * @return {Array} A list of all intermediately reduced values.
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18 | * @see R.reduce, R.mapAccum
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19 | * @example
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20 | *
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21 | * const numbers = [1, 2, 3, 4];
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22 | * const factorials = R.scan(R.multiply, 1, numbers); //=> [1, 1, 2, 6, 24]
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23 | * @symb R.scan(f, a, [b, c]) = [a, f(a, b), f(f(a, b), c)]
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24 | */
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25 |
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26 |
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27 | var scan =
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28 | /*#__PURE__*/
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29 | _curry3(function scan(fn, acc, list) {
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30 | var idx = 0;
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31 | var len = list.length;
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32 | var result = [acc];
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33 |
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34 | while (idx < len) {
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35 | acc = fn(acc, list[idx]);
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36 | result[idx + 1] = acc;
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37 | idx += 1;
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38 | }
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39 |
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40 | return result;
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41 | });
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42 |
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43 | module.exports = scan; |
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