31 lines
879 B
JavaScript
31 lines
879 B
JavaScript
var baseIteratee = require('./_baseIteratee'),
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baseMean = require('./_baseMean');
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/**
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* This method is like `_.mean` except that it accepts `iteratee` which is
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* invoked for each element in `array` to generate the value to be averaged.
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* The iteratee is invoked with one argument: (value).
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*
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* @static
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* @memberOf _
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* @since 4.7.0
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* @category Math
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* @param {Array} array The array to iterate over.
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* @param {Function} [iteratee=_.identity] The iteratee invoked per element.
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* @returns {number} Returns the mean.
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* @example
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*
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* var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
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*
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* _.meanBy(objects, function(o) { return o.n; });
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* // => 5
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*
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* // The `_.property` iteratee shorthand.
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* _.meanBy(objects, 'n');
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* // => 5
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*/
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function meanBy(array, iteratee) {
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return baseMean(array, baseIteratee(iteratee, 2));
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}
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module.exports = meanBy;
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