基于属性的Lotash唯一性

2022-03-09 00:00:00 unique javascript lodash

我有一个对象数组,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,该表达式将基于一个属性生成一个唯一对象数组。例如,如果我使用name,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"}]

解决方案

对于LODASH版本4+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>

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