underscore.js

underscore.js

load('http://underscorejs.org/underscore-min.js');

function json(x) { return JSON.stringify(x); }


sum = 0;
_.each([1, 2, 3],function(i) { sum+=i });
if (sum !== 6) throw '';

sum = 0;
_.each({one: 1, two: 2, three: 3},function(i) { sum+=i });
if (sum !== 6) throw '';

// map
if (json(_.map([1, 2, 3],function(i){ return i*3; })) !== json([3,6,9])) throw ''
if (json(_.map({one: 1, two: 2, three: 3}, function(num,key){ return num*3; })) !== json([3,6,9])) throw ''

// reduce
if (_.reduce([1, 2, 3], function(memo, num){ return memo + num; }, 0) != 6) throw ''


// list
list = [[0, 1], [2, 3], [4, 5]];
flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
if (json(flat) !== json( [4, 5, 2, 3, 0, 1] )) throw '';

// find
even = _.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
if (even !== 2) throw '';

// filter
evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
if (json(evens) !== json([2,4,6])) throw '';

// where
array = [{a:1,b:1,c:11},{a:1,b:1,c:11}, {a:2,b:2,c:4}];
x = _.where(array, {a:1});
if (json(x) != json(  [{a:1,b:1,c:11},{a:1,b:1,c:11}] )) throw '';