javascript - lodash 基于属性的唯一性

Question

我有一系列对象，例如

[{ "name": "Jen", "age":31, "eyecolor": "blue", "hair":"brown"}, 
 { "name": "Jen", "age":32, "eyecolor": "green", "hair":"blonde"}, 
 { "name": "Jules", "age":31, "eyecolor": "blue", "hair":"brown"}, ,
 { "name": "Brian", "age":40, "eyecolor": "blue", "hair":"brown"}]

我需要一个 lodash 表达式，它会产生一组基于一个属性的唯一对象。例如，如果我使用名称，它会给我这三个:

[{ "name": "Jen", "age":31, "eyecolor": "blue", "hair":"brown"}, 
 { "name": "Jules", "age":31, "eyecolor": "blue", "hair":"brown"}, 
 { "name": "Brian", "age":40, "eyecolor": "blue", "hair":"brown"}]

Answer 1

对于 Lodash 版本 4+，请使用 _.uniqBy() :

var arr = [{"name":"Jen","age":31,"eyecolor":"blue","hair":"brown"},{"name":"Jen","age":32,"eyecolor":"green","hair":"blonde"},{"name":"Jules","age":31,"eyecolor":"blue","hair":"brown"},{"name":"Brian","age":40,"eyecolor":"blue","hair":"brown"}];

var unique = _.uniqBy(arr, 'name');

console.log(unique);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>

对于 4 以下的 Lodash 版本，请使用 _.uniq() :

var arr = [{"name":"Jen","age":31,"eyecolor":"blue","hair":"brown"},{"name":"Jen","age":32,"eyecolor":"green","hair":"blonde"},{"name":"Jules","age":31,"eyecolor":"blue","hair":"brown"},{"name":"Brian","age":40,"eyecolor":"blue","hair":"brown"}];

var unique = _.uniq(arr, 'name');

console.log(unique);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.js"></script>