merge-strategy.js•1.53 kB
/**
* @filedescription Merge Strategy
*/
"use strict";
//-----------------------------------------------------------------------------
// Class
//-----------------------------------------------------------------------------
/**
* Container class for several different merge strategies.
*/
class MergeStrategy {
/**
* Merges two keys by overwriting the first with the second.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} The second value.
*/
static overwrite(value1, value2) {
return value2;
}
/**
* Merges two keys by replacing the first with the second only if the
* second is defined.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} The second value if it is defined.
*/
static replace(value1, value2) {
if (typeof value2 !== "undefined") {
return value2;
}
return value1;
}
/**
* Merges two properties by assigning properties from the second to the first.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} A new object containing properties from both value1 and
* value2.
*/
static assign(value1, value2) {
return Object.assign({}, value1, value2);
}
}
exports.MergeStrategy = MergeStrategy;