The Std class provides standard methods for manipulating basic types.

Static methods

staticdowncast<T, S>(value:T, c:Class<S>):S

Checks if object value is an instance of class or interface c.

Compiles only if the type specified by c can be assigned to the type of value.

This method checks if a downcast is possible. That is, if the runtime type of value is assignable to the type specified by c, value is returned. Otherwise null is returned.

This method is not guaranteed to work with core types such as String, Array and Date.

If value is null, the result is null. If c is null, the result is unspecified.

staticinstance<T, S>(value:T, c:Class<S>):S

Deprecated: "Std.instance() is deprecated. Use Std.downcast() instead."


Converts a Float to an Int, rounded towards 0.

If x is outside of the signed Int32 range, or is NaN, NEGATIVE_INFINITY or POSITIVE_INFINITY, the result is unspecified.

staticis(v:Dynamic, t:Dynamic):Bool

Deprecated: " is deprecated. Use Std.isOfType instead."

DEPRECATED. Use Std.isOfType(v, t) instead.

Tells if a value v is of the type t. Returns false if v or t are null.

If t is a class or interface with @:generic meta, the result is false.

@:has_untypedstaticisOfType(v:Dynamic, t:Dynamic):Bool

Tells if a value v is of the type t. Returns false if v or t are null.

If t is a class or interface with @:generic meta, the result is false.


Converts a String to a Float.

The parsing rules for parseInt apply here as well, with the exception of invalid input resulting in a NaN value instead of null. Also, hexadecimal support is not specified.

Additionally, decimal notation may contain a single . to denote the start of the fractions.

It may also end with e or E followed by optional minus or plus sign and a sequence of digits (defines exponent to base 10).


Converts a String to an Int.

Leading whitespaces are ignored.

x may optionally start with a + or - to denote a postive or negative value respectively.

If the optional sign is followed 0x or 0X, hexadecimal notation is recognized where the following digits may contain 0-9 and A-F. Both the prefix and digits are case insensitive.

Otherwise x is read as decimal number with 0-9 being allowed characters. Octal and binary notations are not supported.

Parsing continues until an invalid character is detected, in which case the result up to that point is returned. Scientific notation is not supported. That is Std.parseInt('10e2') produces 10.

If x is null, the result is null. If x cannot be parsed as integer or is empty, the result is null.

If x starts with a hexadecimal prefix which is not followed by at least one valid hexadecimal digit, the result is unspecified.


Return a random integer between 0 included and x excluded.

If x <= 1, the result is always 0.


Converts any value to a String.

If s is of String, Int, Float or Bool, its value is returned.

If s is an instance of a class and that class or one of its parent classes has a toString method, that method is called. If no such method is present, the result is unspecified.

If s is an enum constructor without argument, the constructor's name is returned. If arguments exists, the constructor's name followed by the String representations of the arguments is returned.

If s is a structure, the field names along with their values are returned. The field order and the operator separating field names and values are unspecified.

If s is null, "null" is returned.