6aa588f09f
# Problem
Before this PR, our formatter reformats
```
squares_out = reduce(arr, 0, fn (i, squares) {
return 1
})
```
to
```
squares_out = reduce(arr, 0, (i, squares) {
return 1
})
```
i.e. it removes the `fn` keyword from the closure. This keyword is required, so, our formatter turned working code into invalid code.
# Cause
When this closure parameter is formatted, the ExprContext is ::Decl, so `Expr::recast` skips adding the `fn` keyword. The reason it's ::Decl is because the `squares_out = ` declaration sets it, and no subsequent call sets the context to something else.
# Solution
When recasting a call expression, set the context for every argument to `ExprContext::Other`.
57 lines
91 KiB
Markdown
57 lines
91 KiB
Markdown
---
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title: "map"
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excerpt: "Apply a function to every element of a list."
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layout: manual
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---
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Apply a function to every element of a list.
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Given a list like `[a, b, c]`, and a function like `f`, returns `[f(a), f(b), f(c)]`
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```js
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map(array: [KclValue], map_fn: FunctionParam) -> [KclValue]
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```
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### Arguments
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| Name | Type | Description | Required |
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|----------|------|-------------|----------|
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| `array` | [`[KclValue]`](/docs/kcl/types/KclValue) | | Yes |
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| `map_fn` | `FunctionParam` | | Yes |
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### Returns
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[`[KclValue]`](/docs/kcl/types/KclValue)
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### Examples
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```js
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r = 10 // radius
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fn drawCircle(id) {
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return startSketchOn("XY")
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|> circle({ center = [id * 2 * r, 0], radius = r }, %)
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}
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// Call `drawCircle`, passing in each element of the array.
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// The outputs from each `drawCircle` form a new array,
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// which is the return value from `map`.
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circles = map([1..3], drawCircle)
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```
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```js
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r = 10 // radius
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// Call `map`, using an anonymous function instead of a named one.
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circles = map([1..3], fn(id) {
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return startSketchOn("XY")
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|> circle({ center = [id * 2 * r, 0], radius = r }, %)
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})
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```
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