main repo

node_modules/es-abstract/2023/IsValidIntegerIndex.js

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+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var IsDetachedBuffer = require('./IsDetachedBuffer');
+var IsIntegralNumber = require('./IsIntegralNumber');
+
+var isNegativeZero = require('../helpers/isNegativeZero');
+
+var typedArrayBuffer = require('typed-array-buffer');
+
+// https://262.ecma-international.org/12.0/#sec-isvalidintegerindex
+
+module.exports = function IsValidIntegerIndex(O, index) {
+	// Assert: O is an Integer-Indexed exotic object.
+	var buffer = typedArrayBuffer(O); // step 1
+
+	if (typeof index !== 'number') {
+		throw new $TypeError('Assertion failed: Type(index) is not Number');
+	}
+
+	if (IsDetachedBuffer(buffer)) { return false; } // step 2
+
+	if (!IsIntegralNumber(index)) { return false; } // step 3
+
+	if (isNegativeZero(index)) { return false; } // step 4
+
+	if (index < 0 || index >= O.length) { return false; } // step 5
+
+	return true; // step 6
+};