28 lines
830 B
JavaScript
28 lines
830 B
JavaScript
![]() |
var eq = require('./eq');
|
||
|
|
||
|
/** Used for built-in method references. */
|
||
|
var objectProto = Object.prototype;
|
||
|
|
||
|
/** Used to check objects for own properties. */
|
||
|
var hasOwnProperty = objectProto.hasOwnProperty;
|
||
|
|
||
|
/**
|
||
|
* Assigns `value` to `key` of `object` if the existing value is not equivalent
|
||
|
* using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
|
||
|
* for equality comparisons.
|
||
|
*
|
||
|
* @private
|
||
|
* @param {Object} object The object to modify.
|
||
|
* @param {string} key The key of the property to assign.
|
||
|
* @param {*} value The value to assign.
|
||
|
*/
|
||
|
function assignValue(object, key, value) {
|
||
|
var objValue = object[key];
|
||
|
if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
|
||
|
(value === undefined && !(key in object))) {
|
||
|
object[key] = value;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
module.exports = assignValue;
|