Namespace: from

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

Defaults to defaultValue if value looks like defaultValue.
Source:
core.js, line 530

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`, defaultValues 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.
defaults([1, 2], {a: 1}); // {a: 1}
Example 2.
defaults({}, null); // null: null is not an object literal.
defaults([], null, {'checkLooks': false}); // []: null is an object.
defaults(null, {}); // {}: null is not an object literal.
defaults(null, []); // []: null is not an Array.
Example 3.
defaults(1, NaN); // 1 (NaN is an instance of a Number)
Example 4.
defaults({'a': 1, 'b': 2}, {'a': 'some string'}, {'ignoreDefaultKeys': false}); // {'a': 'some string', 'b': 2}
Example 5.
defaults({'a': 1}, {'b': 2}, {'ignoreDefaultKeys': false}); // {'a': 1, 'b': 2}
defaults({'a': 1}, {'b': 2}, {'ignoreDefaultKeys': true}); // {'a': 1}
Example 6.
defaults(1, null, {'ignoreNull': false}) // null (1 is not an object)
defaults(1, null, {'ignoreNull': true}) // 1
defaults(undefined, null, {'ignoreNull': true}) // null
defaults({a: 1}, {a: null}, {'ignoreNull': true}) // {a: 1}