From 66f747c219c492e9450d2d5b7bf8fb5c74d57dc2 Mon Sep 17 00:00:00 2001
From: Mikola Lysenko <mikolalysenko@gmail.com>
Date: Tue, 9 Apr 2013 20:30:11 -0500
Subject: [PATCH] adding files

---
 .gitignore   | 15 +++++++++++++++
 README.md    | 43 +++++++++++++++++++++++++++++++++++++++++++
 dup.js       | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 test/test.js | 29 +++++++++++++++++++++++++++++
 4 files changed, 136 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 dup.js
 create mode 100644 test/test.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d1b0b0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+
+pids
+logs
+results
+
+npm-debug.log
+node_modules/*
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8e18b8a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+# dup
+Initializes an n-dimensional array to a constant value.
+
+## Install
+
+    npm install dup
+    
+## Example
+
+```javascript
+var dup = require("dup")
+
+console.log(dup(5))
+
+//Prints:
+//
+//    [0, 0, 0, 0, 0]
+//
+
+
+console.log(dup([3,2], 1))
+
+//Prints:
+//
+//    [[1, 1],
+//     [1, 1],
+//     [1, 1]]
+//
+```
+
+## `require("dup")(shape[, value])`
+Initializes an array to a constant value
+
+* `shape` Either an array of dimensions or a scalar, representing the shape of the array to create.
+* `value` The value to initialize the array with.  Default is 0
+
+**Returns** An n-dimensional array with the given shape and value
+
+## Rationale
+I often find myself using [numeric.js'](http://www.numericjs.com/) `rep` method in my projects.  However, for many things pulling in all of numeric.js is total overkill, especially for code that ultimately needs to run on the browser.  So I decided to make this library which just implements the `rep` and nothing else in the spirit of promoting modularity by smaller and more numerous packages.
+
+# Credits
+(c) 2013 Mikola Lysenko. MIT License
\ No newline at end of file
diff --git a/dup.js b/dup.js
new file mode 100644
index 0000000..295044c
--- /dev/null
+++ b/dup.js
@@ -0,0 +1,49 @@
+"use strict"
+
+function dupe_array(count, value, i) {
+  var c = count[i]|0
+  if(c <= 0) {
+    return []
+  }
+  var result = new Array(c), j
+  if(i === count.length-1) {
+    for(j=0; j<c; ++j) {
+      result[j] = value
+    }
+  } else {
+    for(j=0; j<c; ++j) {
+      result[j] = dupe_array(count, value, i+1)
+    }
+  }
+  return result
+}
+
+function dupe_number(count, value) {
+  var result, i
+  result = new Array(count)
+  for(i=0; i<count; ++i) {
+    result[i] = value
+  }
+  return result
+}
+
+function dupe(count, value) {
+  if(typeof value === "undefined") {
+    value = 0
+  }
+  switch(typeof count) {
+    case "number":
+      if(count > 0) {
+        return dupe_number(count|0, value)
+      }
+    break
+    case "object":
+      if(typeof (count.length) === "number") {
+        return dupe_array(count, value, 0)
+      }
+    break
+  }
+  return []
+}
+
+module.exports = dupe
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
new file mode 100644
index 0000000..f75c752
--- /dev/null
+++ b/test/test.js
@@ -0,0 +1,29 @@
+var dup = require("../dup.js")
+
+require("tap").test("dup", function(t) {
+
+  t.equals(dup().length, 0)
+  
+  var a = dup(5)
+  t.equals(a.length, 5)
+  for(var i=0; i<5; ++i) {
+    t.equals(a[i], 0)
+  }
+
+  var b = dup([3,2], 1)
+  t.equals(b.length, 3)
+  for(var i=0; i<3; ++i) {
+    var c = b[i]
+    t.equals(c.length, 2)
+    t.equals(c[0], 1)
+    t.equals(c[1], 1)
+    if(i > 0) {
+      t.assert(b[i] !== b[i-1])
+    }
+  }
+  
+  var c = dup([], 100)
+  t.equals(c.length, 0)
+  
+  t.end()
+})
\ No newline at end of file