| 1 | import eq from './eq';
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| 2 |
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| 3 | /** Used for built-in method references. */
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| 4 | var objectProto = Object.prototype;
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| 5 |
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| 6 | /** Used to check objects for own properties. */
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| 7 | var hasOwnProperty = objectProto.hasOwnProperty;
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| 8 |
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| 9 | /**
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| 10 | * Assigns `value` to `key` of `object` if the existing value is not equivalent
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| 11 | * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
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| 12 | * for equality comparisons.
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| 13 | *
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| 14 | * @private
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| 15 | * @param {Object} object The object to modify.
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| 16 | * @param {string} key The key of the property to assign.
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| 17 | * @param {*} value The value to assign.
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| 18 | */
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| 19 | function assignValue(object, key, value) {
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| 20 | var objValue = object[key];
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| 21 | if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
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| 22 | (value === undefined && !(key in object))) {
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| 23 | object[key] = value;
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| 24 | }
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| 25 | }
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| 26 |
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| 27 | export default assignValue;
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