copy-deep.js
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"use strict";
var forEach = require("./for-each")
, isPlainObject = require("./is-plain-object")
, ensureValue = require("./valid-value")
, isArray = Array.isArray;
var copyValue = function (value, ancestors, ancestorsCopy) {
var mode;
if (isPlainObject(value)) mode = "object";
else if (isArray(value)) mode = "array";
if (!mode) return value;
var copy = ancestorsCopy[ancestors.indexOf(value)];
if (copy) return copy;
copy = mode === "object" ? {} : [];
ancestors.push(value);
ancestorsCopy.push(copy);
if (mode === "object") {
forEach(value, function (item, key) {
copy[key] = copyValue(item, ancestors, ancestorsCopy);
});
} else {
value.forEach(function (item, index) {
copy[index] = copyValue(item, ancestors, ancestorsCopy);
});
}
ancestors.pop();
ancestorsCopy.pop();
return copy;
};
module.exports = function (source) {
return copyValue(ensureValue(source), [], []);
};