Namespace: from

just.from(value, defaultValueopt, opts) → {value}

Defaults to defaultValue if value looks like defaultValue.

Source:: just.js, line 670

Parameters:

Name

Type

Description

value

Any

Any value.

defaultValue
_[optional]

Any

A value with a desired type for value. If an object literal is given, all the keys of value will default to his corresponding key in this object.

opts

object

Some options.

Properties

Name	Type	Default	Description
`ignoreDefaultKeys` _[optional]	boolean	false	If `false` and `defaultValue` is an object literal, the default keys will be added to `value` or checked against this function for each repeated key.
`checkLooks` _[optional]	boolean	true	If `true`: `[]` will match ONLY with another Array. `{}` will match ONLY with another object literal. If `false` `[]` and `{}` will match with any other object.
`checkDeepLooks` _[optional]	boolean	true	Same as `checkLooks` but it works with the inner values of the objects.
`ignoreNull` _[optional]	boolean	false	If `true`, `defaultValue`s with null as a value won't be checked and any `value` (except `undefined`) will be allowed.

Returns:

value if it looks like defaultValue or defaultValue otherwise.

Type: value

Examples

Example 1.

just.defaults([1, 2], {a: 1}); // {a: 1}

Example 2.

just.defaults({}, null); // null: null is not an object literal.
just.defaults([], null, {'checkLooks': false}); // []: null is an object.
just.defaults(null, {}); // {}: null is not an object literal.
just.defaults(null, []); // []: null is not an Array.

Example 3.

just.defaults(1, NaN); // 1 (NaN is an instance of a Number)

Example 4.

just.defaults({'a': 1, 'b': 2}, {'a': 'some string'}, {'ignoreDefaultKeys': false}); // {'a': 'some string', 'b': 2}

Example 5.

just.defaults({'a': 1}, {'b': 2}, {'ignoreDefaultKeys': false}); // {'a': 1, 'b': 2}
just.defaults({'a': 1}, {'b': 2}, {'ignoreDefaultKeys': true}); // {'a': 1}

Example 6.

just.defaults(1, null, {'ignoreNull': false}) // null (1 is not an object)
just.defaults(1, null, {'ignoreNull': true}) // 1
just.defaults(undefined, null, {'ignoreNull': true}) // null
just.defaults({a: 1}, {a: null}, {'ignoreNull': true}) // {a: 1}