add Parallel helper (#60)

src/lang/std/std.test.ts

@@ -0,0 +1,26 @@
+import { abstractSyntaxTree } from '../abstractSyntaxTree'
+import { executor } from '../executor'
+import { lexer } from '../tokeniser'
+import { initPromise } from '../rust'
+
+beforeAll(() => initPromise)
+
+describe('testing angledLineThatIntersects', () => {
+  it('angledLineThatIntersects should intersect with another line', () => {
+    const code = (offset: string) => `const part001 = startSketchAt([0, 0])
+  |> lineTo({to:[2, 2], tag: "yo"}, %)
+  |> lineTo([3, 1], %)
+  |> angledLineThatIntersects({
+  angle: 180,
+  intersectTag: 'yo',
+  offset: ${offset},
+  tag: "yo2"
+}, %)
+const intersect = segEndX('yo2', part001)
+show(part001)`
+    const { root } = executor(abstractSyntaxTree(lexer(code('-1'))))
+    expect(root.intersect.value).toBe(1 + Math.sqrt(2))
+    const { root: noOffset } = executor(abstractSyntaxTree(lexer(code('0'))))
+    expect(noOffset.intersect.value).toBeCloseTo(1)
+  })
+})