WarsawJS

1 _.map([1, 2, 3], function(value) {
2   return value * 3;
3 });
4 // → [3, 6, 9]

1 _.map('Hello World', function(x) {
2   return x.charCodeAt(0);
3 });
4 // → [ 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100 ]

1 _.reduce(
2   [1, 2, 3],
3   function(accumulator, value) {
4     return accumulator + value;
5   },
6   0
7 );
8 // → 6

1 _.reduce(
2   [1, 2, 3],
3   function(accumulator, value) {
4     accumulator[value] = true;
5     return accumulator;
6   },
7   {}
8 );
9 // → {1: true, 2: true, 3: true}

1 _.filter([1, 2, 3, 4, 5, 6], function(value) {
2   return value > 3;
3 });
4 // → [4, 5, 6]

1 _.reject([1, 2, 3, 4, 5, 6], function(value) {
2   return value > 3;
3 });
4 // → [1, 2, 3]

1 _.chain([1, 2, 3, 4, 5, 6])
2   .filter(function(value) { return value > 3; }) // → [4, 5, 6]
3   .map(function(value) { return value * 5; }) // → [20, 25, 30]
4   .reduce(function(accumulator, value) {
5     return accumulator + value;
6   }, 0)
7   .value();
8 // → 75

 1 _.chain([1, 2, 3, 4, 5, 6, 7, 3, 4, 4])
 2   .groupBy(function(item) {
 3     return item;
 4   })
 5   .pairs()
 6   .filter(function(pair) {
 7     return _.last(pair).length > 1;
 8   })
 9   .map(function(pair) {
10     return _.first(pair);
11   })
12   .value();
13    // → ["3","4"]

 1 _.chain([1, 2, 3, 4, 5, 6, 7, 3, 4, 4])
 2   .groupBy(function(item) {})
 3   // → {"1":[1],"2":[2],"3":[3,3],"4":[4,4,4],"5":[5],"6":[6],"7":[7]}
 4   .pairs()
 5   // → [ ["1",[1]],["2",[2]],["3",[3,3]],
 6   //     ["4",[4,4,4]],["5",[5]],["6",[6]],["7",[7]] ]
 7   .filter(function(pair) {})
 8   // → [["3",[3,3]],["4",[4,4,4]]]
 9   .map(function(pair) {})
10   .value();
11    // → ["3","4"]

 1 var item = {"a":{"b":{"c":3}}};
 2 
 3 _.get(item, 'a.b.c', 3);
 4 // → 3
 5 
 6 _.set(item, 'a.b.c', 5);
 7 // → {"a":{"b":{"c":5}}}
 8 
 9 _.has(item, 'a.b.c.d');
10 // → false

1 // avoid costly calculations while the window size is in flux
2 jQuery(window).on('resize', _.debounce(calculateLayout, 150));

1 // avoid excessively updating the position while scrolling
2 jQuery(window).on('scroll', _.throttle(updatePosition, 100));

1 _.startCase('+Hello++world+');
2 // → Hello World

1 _.camelCase('+Hello++world+');
2 // → helloWorld

1 _.snakeCase('+Hello++world+');
2 // → hello_world