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September 1, 2015 01:16
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Variadic sort
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| function getTestPeople() { | |
| return [{ | |
| name: "Kylie", | |
| age: 18 | |
| }, { | |
| name: "Andrew", | |
| age: 23 | |
| }, { | |
| name: "Andrew", | |
| age: 18 | |
| }, { | |
| name: "Clay", | |
| age: 23 | |
| }]; | |
| } | |
| function sort() { | |
| var args = Array.prototype.slice.call(arguments, 0); | |
| var lastArgument = args.splice(args.length - 1)[0]; | |
| var sortFunctions = args; // args was mutated by splice | |
| if (lastArgument.sort) { | |
| return lastArgument.sort(function(a, b) { | |
| for (var i = 0; i < sortFunctions.length; i++) { | |
| var order = sortFunctions[i](a, b); | |
| if (order !== 0) { | |
| return order; | |
| } | |
| } | |
| return 0; | |
| }); | |
| } | |
| // Put the last guy back on, it wasn't an Array | |
| args.push(lastArgument); | |
| return sortFunctions.reduce(function(bound, arg) { | |
| return bound.bind(this, arg); | |
| }.bind(this), sort); | |
| } | |
| function byName(a, b) { | |
| if (a.name > b.name) { | |
| return 1; | |
| } else if (a.name < b.name) { | |
| return -1; | |
| } | |
| return 0; | |
| } | |
| function byAge(a, b) { | |
| return a.age - b.age; | |
| } | |
| var sortByAgeThenName = sort( | |
| byAge, | |
| byName | |
| ); | |
| var sortByNameThenAge = sort( | |
| byName, | |
| byAge | |
| ); | |
| console.log('By Age Then Name'); | |
| console.log(JSON.stringify(sortByAgeThenName(getTestPeople()), null, 2)); | |
| console.log('By Name Then Age'); | |
| console.log(JSON.stringify(sortByNameThenAge(getTestPeople()), null, 2)); |
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