3.0 source code

OfficeWeb/vendor/underscore/test/chaining.js

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+$(document).ready(function() {
+
+  module("Chaining");
+
+  test("map/flatten/reduce", function() {
+    var lyrics = [
+      "I'm a lumberjack and I'm okay",
+      "I sleep all night and I work all day",
+      "He's a lumberjack and he's okay",
+      "He sleeps all night and he works all day"
+    ];
+    var counts = _(lyrics).chain()
+      .map(function(line) { return line.split(''); })
+      .flatten()
+      .reduce(function(hash, l) {
+        hash[l] = hash[l] || 0;
+        hash[l]++;
+        return hash;
+    }, {}).value();
+    ok(counts.a == 16 && counts.e == 10, 'counted all the letters in the song');
+  });
+
+  test("select/reject/sortBy", function() {
+    var numbers = [1,2,3,4,5,6,7,8,9,10];
+    numbers = _(numbers).chain().select(function(n) {
+      return n % 2 === 0;
+    }).reject(function(n) {
+      return n % 4 === 0;
+    }).sortBy(function(n) {
+      return -n;
+    }).value();
+    equal(numbers.join(', '), "10, 6, 2", "filtered and reversed the numbers");
+  });
+
+  test("select/reject/sortBy in functional style", function() {
+    var numbers = [1,2,3,4,5,6,7,8,9,10];
+    numbers = _.chain(numbers).select(function(n) {
+      return n % 2 === 0;
+    }).reject(function(n) {
+      return n % 4 === 0;
+    }).sortBy(function(n) {
+      return -n;
+    }).value();
+    equal(numbers.join(', '), "10, 6, 2", "filtered and reversed the numbers");
+  });
+
+  test("reverse/concat/unshift/pop/map", function() {
+    var numbers = [1,2,3,4,5];
+    numbers = _(numbers).chain()
+      .reverse()
+      .concat([5, 5, 5])
+      .unshift(17)
+      .pop()
+      .map(function(n){ return n * 2; })
+      .value();
+    equal(numbers.join(', '), "34, 10, 8, 6, 4, 2, 10, 10", 'can chain together array functions.');
+  });
+
+  test("chaining works in small stages", function() {
+    var o = _([1, 2, 3, 4]).chain();
+    deepEqual(o.filter(function(i) { return i < 3; }).value(), [1, 2]);
+    deepEqual(o.filter(function(i) { return i > 2; }).value(), [3, 4]);
+  });
+
+});