Initial upload

julia/pascals-triangle/.exercism/metadata.json

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+{"track":"julia","exercise":"pascals-triangle","id":"802dc59e8eb8489f9fa601b08be5a1ac","url":"https://exercism.io/my/solutions/802dc59e8eb8489f9fa601b08be5a1ac","handle":"halfdan","is_requester":true,"auto_approve":false}

julia/pascals-triangle/README.md

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+# Pascal's Triangle
+
+Compute Pascal's triangle up to a given number of rows.
+
+In Pascal's Triangle each number is computed by adding the numbers to
+the right and left of the current position in the previous row.
+
+```text
+    1
+   1 1
+  1 2 1
+ 1 3 3 1
+1 4 6 4 1
+# ... etc
+```
+
+## Source
+
+Pascal's Triangle at Wolfram Math World [http://mathworld.wolfram.com/PascalsTriangle.html](http://mathworld.wolfram.com/PascalsTriangle.html)
+
+## Version compatibility
+This exercise has been tested on Julia versions >=1.0.
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

julia/pascals-triangle/pascals-triangle.ipynb

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+{
+    "cells": [
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": ["# Pascal's Triangle\n", "\n", "Compute Pascal's triangle up to a given number of rows.\n", "\n", "In Pascal's Triangle each number is computed by adding the numbers to\n", "the right and left of the current position in the previous row.\n", "\n", "```text\n", "    1\n", "   1 1\n", "  1 2 1\n", " 1 3 3 1\n", "1 4 6 4 1\n", "# ... etc\n", "```\n", "\n", "## Source\n", "\n", "Pascal's Triangle at Wolfram Math World [http://mathworld.wolfram.com/PascalsTriangle.html](http://mathworld.wolfram.com/PascalsTriangle.html)\n", "\n", "## Version compatibility\n", "This exercise has been tested on Julia versions >=1.0.\n", "\n", "## Submitting Incomplete Solutions\n", "It's possible to submit an incomplete solution so you can see how others have completed the exercise."]
+        },
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": ["## Your solution"]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {},
+            "outputs": [],
+            "source": ["# submit\n", "function triangle(n)\n", "\n", "end"]
+        },
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": ["## Test suite"]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {},
+            "outputs": [],
+            "source": ["using Test\n", "\n", "# include(\"pascals-triangle.jl\")\n", "\n", "const rows = [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1], [1, 5, 10, 10, 5, 1], [1, 6, 15, 20, 15, 6, 1], [1, 7, 21, 35, 35, 21, 7, 1], [1, 8, 28, 56, 70, 56, 28, 8, 1], [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]]\n", "\n", "@testset \"$i row(s)\" for i in eachindex(rows)\n", "    @test triangle(i) == @view rows[1:i]\n", "end\n", "\n", "@testset \"special cases\" begin\n", "    @test_throws DomainError triangle(-1)\n", "    @test isempty(triangle(0))\n", "end"]
+        },
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": [
+                "## Prepare submission\n",
+                "To submit your exercise, you need to save your solution in a file called `pascals-triangle.jl` before using the CLI.\n",
+                "You can either create it manually or use the following functions, which will automatically write every notebook cell that starts with `# submit` to the file `pascals-triangle.jl`.\n"
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {},
+            "outputs": [],
+            "source": [
+                "# using Pkg; Pkg.add(\"Exercism\")\n",
+                "# using Exercism\n",
+                "# Exercism.create_submission(\"pascals-triangle\")"
+            ]
+        }
+    ],
+    "metadata": {
+        "kernelspec": {
+            "display_name": "Julia 1.3.0",
+            "language": "julia",
+            "name": "julia-1.3"
+        },
+        "language_info": {
+            "file_extension": ".jl",
+            "mimetype": "application/julia",
+            "name": "julia",
+            "version": "1.3.0"
+        }
+    },
+    "nbformat": 4,
+    "nbformat_minor": 2
+}

julia/pascals-triangle/pascals-triangle.jl

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+function triangle(n)
+    n == 0 && return []
+    n < 0 && throw(DomainError("Invalid n given"))
+    rows = [[1]]
+    for _ ∈ 2:n
+        push!(rows, [a+b for (a,b) ∈ zip([0;rows[end]], [rows[end]; 0])]) 
+    end
+    rows
+end

julia/pascals-triangle/runtests.jl

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+using Test
+
+include("pascals-triangle.jl")
+
+const rows = [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1], [1, 5, 10, 10, 5, 1], [1, 6, 15, 20, 15, 6, 1], [1, 7, 21, 35, 35, 21, 7, 1], [1, 8, 28, 56, 70, 56, 28, 8, 1], [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]]
+
+@testset "$i row(s)" for i in eachindex(rows)
+    @test triangle(i) == @view rows[1:i]
+end
+
+@testset "special cases" begin
+    @test_throws DomainError triangle(-1)
+    @test isempty(triangle(0))
+end