@antv/layout/lib/node_modules/lodash/_isIndex.js

graph layout algorithm

/** Used as references for various `Number` constants. */

var _isIndex;
var hasRequired_isIndex;

function require_isIndex () {
	if (hasRequired_isIndex) return _isIndex;
	hasRequired_isIndex = 1;
	var MAX_SAFE_INTEGER = 9007199254740991;

	/** Used to detect unsigned integer values. */
	var reIsUint = /^(?:0|[1-9]\d*)$/;

	/**
	 * Checks if `value` is a valid array-like index.
	 *
	 * @private
	 * @param {*} value The value to check.
	 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
	 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
	 */
	function isIndex(value, length) {
	  var type = typeof value;
	  length = length == null ? MAX_SAFE_INTEGER : length;

	  return !!length &&
	    (type == 'number' ||
	      (type != 'symbol' && reIsUint.test(value))) &&
	        (value > -1 && value % 1 == 0 && value < length);
	}

	_isIndex = isIndex;
	return _isIndex;
}

export { require_isIndex as __require };
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