Type: Number

A collection of the Number Object methods and functions.

Смотрите также:

• MDC Number

Notes:

Every Math method is mirrored in the Number object, both as prototype and generic.

Function: Number.from

Returns the passed parameter as a Number, or null if not a number.

Syntax:

Number.from(arg);

Аргументы:

1. arg - (mixed) The argument to return as a number.

Возвращает:

• (number) The argument as a number.
• (null) Returns null if the number cannot be converted.

Пример:

Number.from('12')       // returns 12
Number.from('hello')    // returns null

Function: Number.random

Returns a random integer between the two passed in values.

Syntax:

var random = Number.random(min, max);

Аргументы:

1. min - (number) The minimum value (inclusive).
2. max - (number) The maximum value (inclusive).

Возвращает:

• (number) A random number between min and max.

Пример:

Number.random(5, 20); // returns a random number between 5 and 20.

Number method: limit

Limits this number between two bounds.

Syntax:

myNumber.limit(min, max);

Аргументы:

1. min - (number) The minimum possible value.
2. max - (number) The maximum possible value.

Возвращает:

• (number) The number bounded between the given limits.

Examples:

(12).limit(2, 6.5);  // returns 6.5
(-4).limit(2, 6.5);  // returns 2
(4.3).limit(2, 6.5); // returns 4.3

Number method: round

Returns this number rounded to the specified precision.

Syntax:

myNumber.round([precision]);

Аргументы:

1. precision - (number, optional: defaults to 0) The number of digits after the decimal place.

Возвращает:

• (number) The number, rounded.

Notes:

• Argument may also be negative.

Examples:

(12.45).round()   // returns 12
(12.45).round(1)  // returns 12.5
(12.45).round(-1) // returns 10

Number method: times

Executes the function passed in the specified number of times.

Syntax:

myNumber.times(fn[, bind]);

Аргументы:

1. fn - (function) The function which should be executed on each iteration of the loop. This function is passed the current iteration's index.
2. bind - (object, optional) The object to use as 'this' in the function. For more information see Function:bind.

Examples:

(4).times(alert); // alerts "0", then "1", then "2", then "3".

Number method: toFloat

Returns this number as a float. Useful because toFloat must work on both Strings and Numbers.

Syntax:

myNumber.toFloat();

Возвращает:

• (number) The number as a float.

Examples:

(111).toFloat(); // returns 111
(111.1).toFloat(); // returns 111.1

Number method: toInt

Returns this number as another number with the passed in base. Useful because toInt must work on both Strings and Numbers.

Syntax:

myNumber.toInt([base]);

Аргументы:

1. base - (number, optional: defaults to 10) The base to use.

Возвращает:

• (number) A number with the base provided.

Examples:

(111).toInt(); // returns 111
(111.1).toInt(); // returns 111
(111).toInt(2); // returns 7

Math Methods

There are several methods available from the Math object that can be used as Number Methods.

• abs
• acos
• asin
• atan2
• ceil
• cos
• exp
• floor
• log
• max
• min
• pow
• sin
• sqrt
• tan

Examples:

(-1).abs(); // returns 1
(3).pow(4); // returns 81