The BigUint64Array typed array represents an array of 64-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0n unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

The Math.trunc() static method returns the integer part of a number by removing any fractional digits.

The endsWith() method of String values determines whether a string ends with the characters of this string, returning true or false as appropriate.

The Math.sin() static method returns the sine of a number in radians.

The hourCycle accessor property of Intl.Locale instances returns the hour cycle type for this locale.

The toLocaleString() method of Number values returns a string with a language-sensitive representation of this number. In implementations with Intl.NumberFormat API support, this method delegates to Intl.NumberFormat.

The getWeekInfo() method of Intl.Locale instances returns a weekInfo object with the properties firstDay, weekend and minimalDays for this locale.

The getTextInfo() method of Intl.Locale instances returns the ordering of characters indicated by either ltr (left-to-right) or by rtl (right-to-left) for this locale.

The filter() method of TypedArray instances creates a copy of a portion of a given typed array, filtered down to just the elements from the given typed array that pass the test implemented by the provided function. This method has the same algorithm as Array.prototype.filter().

The toLocaleString() method of TypedArray instances returns a string representing the elements of the typed array. The elements are converted to strings using their toLocaleString methods and these strings are separated by a locale-specific string (such as a comma ","). This method has the same algorithm as Array.prototype.toLocaleString().