16 lines
397 B
JavaScript
16 lines
397 B
JavaScript
'use strict';
|
|
|
|
var _require = require('../helpers/is'),
|
|
isFunction = _require.isFunction;
|
|
|
|
module.exports = function average(key) {
|
|
if (key === undefined) {
|
|
return this.sum() / this.items.length;
|
|
}
|
|
|
|
if (isFunction(key)) {
|
|
return new this.constructor(this.items).sum(key) / this.items.length;
|
|
}
|
|
|
|
return new this.constructor(this.items).pluck(key).sum() / this.items.length;
|
|
}; |