115 lines
1.9 KiB
Markdown
115 lines
1.9 KiB
Markdown
---
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title: "object"
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description: "Object creation and manipulation"
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weight: 40
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type: "docs"
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---
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The `object` function is an intrinsic (always available, no `use()` needed). It is **polymorphic** — its behavior depends on the types of its arguments.
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## From a Record
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### object(obj)
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Shallow copy an object.
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```javascript
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var copy = object(original)
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```
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### object(obj, another)
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Combine two objects.
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```javascript
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object({a: 1}, {b: 2}) // {a: 1, b: 2}
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object({a: 1}, {a: 2}) // {a: 2}
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```
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### object(obj, keys)
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Select specific keys.
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```javascript
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object({a: 1, b: 2, c: 3}, ["a", "c"]) // {a: 1, c: 3}
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```
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## From an Array of Keys
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### object(keys)
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Create object from keys (values are `true`).
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```javascript
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object(["a", "b", "c"]) // {a: true, b: true, c: true}
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```
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### object(keys, value)
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Create object from keys with specified value.
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```javascript
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object(["a", "b"], 0) // {a: 0, b: 0}
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```
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### object(keys, fn)
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Create object from keys with computed values.
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```javascript
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object(["a", "b", "c"], (k, i) => i) // {a: 0, b: 1, c: 2}
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```
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## Prototypes
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### meme(prototype)
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Create a new object with the given prototype.
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```javascript
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var animal = {speak: function() { print("...") }}
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var dog = meme(animal)
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dog.speak = function() { print("woof") }
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```
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### proto(obj)
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Get an object's prototype.
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```javascript
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var p = proto(dog) // animal
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```
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### isa(obj, prototype)
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Check if prototype is in the chain.
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```javascript
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isa(dog, animal) // true
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```
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## Serialization
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### splat(obj)
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Flatten an object's prototype chain into a plain object. Only includes primitive types (numbers, text, booleans, arrays, objects).
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```javascript
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var base = {x: 1}
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var derived = meme(base)
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derived.y = 2
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splat(derived) // {x: 1, y: 2}
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```
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When sending objects between actors with `$send`, they are automatically splatted.
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## Key Iteration
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```javascript
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var obj = {a: 1, b: 2, c: 3}
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// Get all keys
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var keys = array(obj) // ["a", "b", "c"]
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```
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