40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
var castPath = require('./_castPath'),
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isArguments = require('./isArguments'),
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isArray = require('./isArray'),
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isIndex = require('./_isIndex'),
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isLength = require('./isLength'),
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toKey = require('./_toKey');
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/**
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* Checks if `path` exists on `object`.
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*
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* @private
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* @param {Object} object The object to query.
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* @param {Array|string} path The path to check.
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* @param {Function} hasFunc The function to check properties.
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* @returns {boolean} Returns `true` if `path` exists, else `false`.
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*/
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function hasPath(object, path, hasFunc) {
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path = castPath(path, object);
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var index = -1,
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length = path.length,
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result = false;
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while (++index < length) {
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var key = toKey(path[index]);
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if (!(result = object != null && hasFunc(object, key))) {
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break;
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}
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object = object[key];
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}
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if (result || ++index != length) {
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return result;
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}
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length = object == null ? 0 : object.length;
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return !!length && isLength(length) && isIndex(key, length) &&
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(isArray(object) || isArguments(object));
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}
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module.exports = hasPath;
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