Data commit

Task/Align-columns/JavaScript/align-columns-1.js

@@ -0,0 +1,31 @@
+var justification="center",
+input=["Given$a$text$file$of$many$lines,$where$fields$within$a$line$",
+"are$delineated$by$a$single$'dollar'$character,$write$a$program",
+"that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$",
+"column$are$separated$by$at$least$one$space.",
+"Further,$allow$for$each$word$in$a$column$to$be$either$left$",
+"justified,$right$justified,$or$center$justified$within$its$column."],
+x,y,cols,max,cols=0,diff,left,right
+
+String.prototype.repeat=function(n){return new Array(1 + parseInt(n)).join(this);}
+
+for(x=0;x<input.length;x++) {
+ input[x]=input[x].split("$");
+ if(input[x].length>cols) cols=input[x].length;
+}
+for(x=0;x<cols;x++) {
+ max=0;
+ for(y=0;y<input.length;y++) if(input[y][x]&&max<input[y][x].length) max=input[y][x].length;
+ for(y=0;y<input.length;y++)
+  if(input[y][x]) {
+   diff=(max-input[y][x].length)/2;
+   left=" ".repeat(Math.floor(diff));
+   right=" ".repeat(Math.ceil(diff));
+   if(justification=="left") {right+=left;left=""}
+   if(justification=="right") {left+=right;right=""}
+   input[y][x]=left+input[y][x]+right;
+  }
+}
+for(x=0;x<input.length;x++) input[x]=input[x].join(" ");
+input=input.join("\n");
+document.write(input);

Task/Align-columns/JavaScript/align-columns-2.js

@@ -0,0 +1,48 @@
+//break up each string by '$'. The assumption is that the user wants the trailing $.
+var data = [
+  "Given$a$text$file$of$many$lines,$where$fields$within$a$line$",
+  "are$delineated$by$a$single$'dollar'$character,$write$a$program",
+  "that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$",
+  "column$are$separated$by$at$least$one$space.",
+  "Further,$allow$for$each$word$in$a$column$to$be$either$left$",
+  "justified,$right$justified,$or$center$justified$within$its$column."
+].map(function (str) { return str.split('$'); })
+
+//boilerplate: get longest array or string in array
+var getLongest = function (arr) {
+  return arr.reduce(function (acc, item) { return acc.length > item.length ? acc : item; }, 0);
+};
+
+//boilerplate: this function would normally be in a library like underscore, lodash, or ramda
+var zip = function (items, toInsert) {
+  toInsert = (toInsert === undefined) ? null : toInsert;
+  var longestItem = getLongest(items);
+  return longestItem.map(function (_unused, index) {
+    return items.map(function (item) {
+      return item[index] === undefined ? toInsert : item[index];
+    });
+  });
+};
+
+//here's the part that's not boilerplate
+var makeColumns = function (formatting, data) {
+  var zipData = zip(data, '');
+  var makeSpaces = function (num) { return new Array(num + 1).join(' '); };
+  var formattedCols = zipData.map(function (column) {
+    var maxLen = getLongest(column).length;//find the maximum word length
+    if (formatting === 'left') {
+      return column.map(function (word) { return word + makeSpaces(maxLen - word.length); });
+    } else if (formatting === 'right') {
+      return column.map(function (word) { return makeSpaces(maxLen - word.length) + word; });
+    } else {
+      return column.map(function (word) {
+        var spaces = maxLen - word.length,
+            first = ~~(spaces / 2),
+            last = spaces - first;
+        return makeSpaces(first) + word + makeSpaces(last);
+      });
+    }
+  });
+
+  return zip(formattedCols).map(function (row) { return row.join(' '); }).join('\n');
+};

Task/Align-columns/JavaScript/align-columns-3.js

@@ -0,0 +1,133 @@
+(function (strText) {
+    'use strict';
+
+    // [[a]] -> [[a]]
+    function transpose(lst) {
+        return lst[0].map(function (_, iCol) {
+            return lst.map(function (row) {
+                return row[iCol];
+            })
+        });
+    }
+
+    // (a -> b -> c) -> [a] -> [b] -> [c]
+    function zipWith(f, xs, ys) {
+        return xs.length === ys.length ? (
+            xs.map(function (x, i) {
+                return f(x, ys[i]);
+            })
+        ) : undefined;
+    }
+
+    // (a -> a -> Ordering) -> [a] -> a
+    function maximumBy(f, xs) {
+        return xs.reduce(function (a, x) {
+            return a === undefined ? x : (
+                f(x) > f(a) ? x : a
+            );
+        }, undefined)
+    }
+
+    // [String] -> String
+    function widest(lst) {
+        return maximumBy(length, lst)
+            .length;
+    }
+
+    // [[a]] -> [[a]]
+    function fullRow(lst, n) {
+        return lst.concat(Array.apply(null, Array(n - lst.length))
+            .map(function () {
+                return ''
+            }));
+    }
+
+    // String -> Int -> String
+    function nreps(s, n) {
+        var o = '';
+        if (n < 1) return o;
+        while (n > 1) {
+            if (n & 1) o += s;
+            n >>= 1;
+            s += s;
+        }
+        return o + s;
+    }
+
+    // [String] -> String
+    function unwords(xs) {
+        return xs.join('  ');
+    }
+
+    // [String] -> String
+    function unlines(xs) {
+        return xs.join('\n');
+    }
+
+    // [a] -> Int
+    function length(xs) {
+        return xs.length;
+    }
+
+    // -- Int -> [String] -> [[String]]
+    function padWords(n, lstWords, eAlign) {
+        return lstWords.map(function (w) {
+            var lngPad = n - w.length;
+
+            return (
+                    (eAlign === eCenter) ? (function () {
+                        var lngHalf = Math.floor(lngPad / 2);
+
+                        return [
+                            nreps(' ', lngHalf), w,
+                            nreps(' ', lngPad - lngHalf)
+                        ];
+                    })() : (eAlign === eLeft) ?
+                        ['', w, nreps(' ', lngPad)] :
+                        [nreps(' ', lngPad), w, '']
+                )
+                .join('');
+        });
+    }
+
+    // MAIN
+
+    var eLeft = -1,
+        eCenter = 0,
+        eRight = 1;
+
+    var lstRows = strText.split('\n')
+        .map(function (x) {
+            return x.split('$');
+        }),
+
+        lngCols = widest(lstRows),
+        lstCols = transpose(lstRows.map(function (r) {
+            return fullRow(r, lngCols)
+        })),
+        lstColWidths = lstCols.map(widest);
+
+    // THREE PARAGRAPHS, WITH VARIOUS WORD COLUMN ALIGNMENTS:
+
+    return [eLeft, eRight, eCenter]
+        .map(function (eAlign) {
+            var fPad = function (n, lstWords) {
+                return padWords(n, lstWords, eAlign);
+            };
+
+            return transpose(
+                    zipWith(fPad, lstColWidths, lstCols)
+                )
+                .map(unwords);
+        })
+        .map(unlines)
+        .join('\n\n');
+
+})(
+    "Given$a$text$file$of$many$lines,$where$fields$within$a$line$\n\
+are$delineated$by$a$single$'dollar'$character,$write$a$program\n\
+that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$\n\
+column$are$separated$by$at$least$one$space.\n\
+Further,$allow$for$each$word$in$a$column$to$be$either$left$\n\
+justified,$right$justified,$or$center$justified$within$its$column."
+);