1.1.1InitializeUnitFormat (unitFormat, locales, options)

The abstract operation InitializeUnitFormat accepts the arguments unitFormat (which must be an object), locales, and options. It initializes unitFormat as a UnitFormat object. It performs the following steps:

1.1.2DeconstructPattern (pattern, placeables)

The DeconstructPattern abstract operation is called with arguments pattern (which must be a String) and placeables (which must be an Object), and deconstructts the pattern string into a list of parts. Example:

        Input:
          DeconstructPattern("AA{xx}BB{yy}CC", {
            xx: {type: 'hour', value: '15'},
            yy: {type: 'minute', value: '06'}
          });

        Output:
          [
            {type: 'literal', value: 'AA'},
            {type: 'hour', value: '15'},
            {type: 'literal', value: 'BB'},
            {type: 'minute', value: '06'},
            {type: 'literal', value: 'CC'}
          ]
        

1.1.3CreatePartsFromPattern (unitFormat, value)

The CreatePartsFromPattern abstract operation is called with arguments unitFormat (which must be an object initialized as a UnitFormat) and value (which must be a Number), and creates the corresponding parts according to the effective locale and the formatting options of unitFormat. The following steps are taken:

1.1.4FormatUnit(unitFormat, value)

The FormatUnit abstract operation is called with arguments unitFormat (which must be an object initialized as a UnitFormat) and list (which must be an Array), and performs the following steps:

1.1.5FormatUnitToParts(unitFormat, value)

The FormatUnitToParts abstract operation is called with arguments unitFormat (which must be an object initialized as a UnitFormat) and value (which must be a Number), and performs the following steps:

1.2.1Intl.UnitFormat([ locales [, options]])

When the Intl.UnitFormat function is called with optional arguments the following steps are taken:

1.3.1Intl.UnitFormat.prototype

The value of Intl.UnitFormat.prototype is %UnitFormatPrototype%.

This property has the attributes { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: false }.

1.3.2Intl.UnitFormat.supportedLocalesOf (locales [, options ])

When the supportedLocalesOf method of %UnitFormat% is called, the following steps are taken:

The value of the length property of the supportedLocalesOf method is 1.

1.3.3Internal slots

The value of the [[relevantExtensionKeys]] internal slot is [].

The value of the [[availableLocales]] internal slot is implementation defined within the constraints described in .

The value of the [[localeData]] internal slot is implementation defined within the constraints described in and the following additional constraints:

• [[localeData]][locale] must have a formats property for all locale values. The value of this property must be an object, which must have properties with the names of the two list formatting types: "regular" and "unit". Each object must have properties with the names of three formatting styles: "long", "short" and "narrow". Each of those properties must be objects themselves, and each must have properties with names of templates: "2", "start", "middle" and "end. Each of those properties must be a template string as specified in LDML List Format Rules.

1.4.1Intl.UnitFormat.prototype.constructor

The initial value of Intl.UnitFormat.prototype.constructor is %UnitFormat%.

1.4.2Intl.UnitFormat.prototype[ @@toStringTag ]

The initial value of the @@toStringTag property is the string value "Object".

This property has the attributes { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }.

1.4.3Intl.UnitFormat.prototype.format ([ value ])

Intl.UnitFormat.prototype.format is an accessor property whose set accessor function is undefined. Its get accessor function performs the following steps:

1.4.4Intl.UnitFormat.prototype.formatToParts ([ value ])

Intl.UnitFormat.prototype.format is an accessor property whose set accessor function is undefined. Its get accessor function performs the following steps:

1.4.5Intl.UnitFormat.prototype.resolvedOptions ()

This function provides access to the locale and options computed during initialization of the object.

The function returns a new object whose properties and attributes are set as if constructed by an object literal assigning to each of the following properties the value of the corresponding internal slot of this UnitFormat object (see 1.5): locale and style. Properties whose corresponding internal slots are not present are not assigned.