![]() ![]() Values higher than that are replaced with the special number constant Infinity. The largest value a number can hold is 2 1024 - 1 (with the exponent being 1023 and the mantissa being 0.1111… in base 2), which is obtainable via Number.MAX_VALUE. Therefore, the mantissa's precision is 2 -52 (obtainable via Number.EPSILON), or about 15 to 17 decimal places arithmetic above that level of precision is subject to rounding. The mantissa is stored with 52 bits, interpreted as digits after 1.… in a binary fractional number. Number = ( − 1 ) sign ⋅ ( 1 mantissa ) ⋅ 2 exponent \text ![]() Thinking about it as scientific notation: The exponent is the power of 2 that the mantissa should be multiplied by. The mantissa (also called significand) is the part of the number representing the actual value (significant digits). 52 bits for the mantissa (representing a number between 0 and 1).1 bit for the sign (positive or negative).Very briefly, an IEEE 754 double-precision number uses 64 bits to represent 3 parts: This means it can represent fractional values, but there are some limits to the stored number's magnitude and precision. The JavaScript Number type is a double-precision 64-bit binary format IEEE 754 value, like double in Java or C#. Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.Object.prototype._defineGetter_() Deprecated.The data(using:) method on a Swift String returns Data, which can be cast using as to NSData. Convert a String to UTF-8, UTF-16, and UTF-32 The String method data(using:) takes in an enum specifying how the String should be encoded and returns an optional Data, with enum options like. There are three different types of Unicode character encodings: UTF-8, UTF-16 and UTF-32. Convert a String to BoolĬonvert a String into Unicode (UTF-8, UTF-16, UTF-32) ![]() Convert a String to FloatĪlthough the Bool type does not have a dedicated constructor that takes a String, comparison can be used to convert a String to a Bool. One constructor of the Swift type Float, and similarly Float80, takes in a String argument and returns an optional parsed value. Convert a String to DoubleĬonvert a String into a Float and Float80 One constructor of the Swift type Double takes in a String argument and returns an optional parsed value. Just like Int, the Swift type UInt, and related UInt8, UInt16, UInt32, and UInt64, contain a constructor that takes in a String argument and return an optional parsed value. Convert String to IntĬonvert a String into a UInt, UInt8, UInt16, UInt32, and UInt64 The Swift type Int, and related Int8, Int16, Int32, and Int64, contain a constructor that takes in a String argument and return an optional parsed value. Example: let nsString: NSString = "NS"Ĭonvert a String into an Int, Int8, Int16, Int32, and Int64 An NSString can be cast to a String using as. The examples in this post also apply to NSString.
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