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A Lens Library for Javascript
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<h1 class="page-title">Source: combinator/MultiLens.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
var _ = require('lodash'),
Lens = require('./../Lens'),
get,
map,
MultiLens;
get = function (lenses) {
return function (obj) {
var gets;
if (_.isArray(lenses)) {
gets = [];
_.forEach(lenses, function (lens) {
gets.push(lens.get(obj));
});
} else {
if (_.isObject(lenses)) {
gets = {};
_.forEach(_.keys(lenses), function (key) {
gets[key] = lenses[key].get(obj);
});
}
}
return gets;
};
};
map = function (lenses) {
return function (obj, func) {
var newObj = _.cloneDeep(obj);
if (_.isArray(lenses)) {
_.forEach(lenses, function (lens) {
newObj = lens.map(newObj, func);
});
} else {
if (_.isObject(lenses)) {
_.forEach(_.values(lenses), function (lens) {
newObj = lens.map(newObj, func);
});
}
}
return newObj;
};
};
/**
* A `MultiLens` is a `Lens` that can view on multiple things at once. It takes
* an array of `Lens`es or an object with `Lens`es as values; `get`, `set` and `map`
* run corresponding functions over the input object for each internal lens.
*
* @param {object|Array} lenses Lenses used to view on input objects.
* @param {object} flags Additional flags to add to the Lens instance
* @returns {MultiLens}
* @constructor
*/
MultiLens = function (lenses, flags) {
flags = flags || {};
// Guard against no 'new'
if (!this instanceof MultiLens) {
return new MultiLens(lenses, flags);
}
flags._multi = true;
if (_.isObject(lenses)) {
_.forEach(_.keys(lenses), function (key) {
if (!((lenses[key] instanceof Lens) || (lenses[key] instanceof MultiLens))) {
throw new Error('Cannot construct MultiLens from non-lens');
}
});
this._lenses = lenses;
}
if (_.isArray(lenses)) {
_.forEach(lenses, function (lens) {
if (!((lens instanceof Lens) || (lens instanceof MultiLens))) {
throw new Error('Cannot construct MultiLens from non-lens');
}
});
this._lenses = lenses;
}
this.base = Lens;
this.base(get(lenses), map(lenses), flags);
};
MultiLens.prototype = new Lens;
module.exports = MultiLens;</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Compose.html">Compose</a></li><li><a href="Getter.html">Getter</a></li><li><a href="IndexedLens.html">IndexedLens</a></li><li><a href="IndexedLens.Unsafe.html">Unsafe</a></li><li><a href="Lens.html">Lens</a></li><li><a href="MultiLens.html">MultiLens</a></li><li><a href="Optional.html">Optional</a></li><li><a href="PathLens.html">PathLens</a></li><li><a href="PathLens.Unsafe.html">Unsafe</a></li><li><a href="Setter.html">Setter</a></li><li><a href="SliceLens.html">SliceLens</a></li></ul><h3>Global</h3><ul><li><a href="global.html#get">get</a></li><li><a href="global.html#IdLens">IdLens</a></li><li><a href="global.html#map">map</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-alpha11</a> on Wed Dec 17 2014 09:18:53 GMT-0500 (EST)
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