seebigs-extend

Does a shallow extend but clones whatever values are passed.

The first argument is mutated. Undefined values are ignored.

var extend = require('seebigs-extend');

var one = {
    a: {
        b: 1,
        c: 1,
    }
};

var two = {
    c: 2,
    d: 2,
};

extend(one, {
    a: two
});

two.d = 3;

/* one ===
{
    a: {
        c: 2,
        d: 2,
    }
}
*/

Properties on the extended objects are cloned with the following behavior:

• Unclonable values are assigned outright (String, Boolean, Number, Null, Undefined, Window)
• Plain Objects inherit the same prototype then recursively deep copy each property
• Arrays clone all values into a new array
• Some objects are mostly-cloned but will report as [object Object] (HTMLCollections)
• Sometimes we choose not to clone for simplicity and return same value (Date, RegExp)