32 lines
965 B
JavaScript
32 lines
965 B
JavaScript
"use strict";
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/**
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* Returns `true` when the value is a regular Object and not a specialized Object
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*
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* This helps speed up deepEqual cyclic checks
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*
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* The premise is that only Objects are stored in the visited array.
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* So if this function returns false, we don't have to do the
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* expensive operation of searching for the value in the the array of already
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* visited objects
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*
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* @private
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* @param {object} value The object to examine
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* @returns {boolean} `true` when the object is a non-specialised object
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*/
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function isObject(value) {
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return (
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typeof value === "object" &&
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value !== null &&
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// none of these are collection objects, so we can return false
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!(value instanceof Boolean) &&
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!(value instanceof Date) &&
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!(value instanceof Error) &&
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!(value instanceof Number) &&
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!(value instanceof RegExp) &&
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!(value instanceof String)
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);
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}
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module.exports = isObject;
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