1
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var baseFlatten = require('./_baseFlatten'),
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2
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map = require('./map'),
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3
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toInteger = require('./toInteger');
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4
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5
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/**
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6
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* This method is like `_.flatMap` except that it recursively flattens the
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7
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* mapped results up to `depth` times.
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8
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*
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9
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* @static
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10
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* @memberOf _
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11
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* @since 4.7.0
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12
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* @category Collection
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13
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* @param {Array|Object} collection The collection to iterate over.
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14
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* @param {Function} [iteratee=_.identity] The function invoked per iteration.
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15
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* @param {number} [depth=1] The maximum recursion depth.
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16
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* @returns {Array} Returns the new flattened array.
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17
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* @example
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18
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*
|
19
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* function duplicate(n) {
|
20
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* return [[[n, n]]];
|
21
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* }
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22
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*
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23
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* _.flatMapDepth([1, 2], duplicate, 2);
|
24
|
* // => [[1, 1], [2, 2]]
|
25
|
*/
|
26
|
function flatMapDepth(collection, iteratee, depth) {
|
27
|
depth = depth === undefined ? 1 : toInteger(depth);
|
28
|
return baseFlatten(map(collection, iteratee), depth);
|
29
|
}
|
30
|
|
31
|
module.exports = flatMapDepth;
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