本文介绍JavaScript的展开操作符(Spread operator)...。本文适合ES6初学者。 你可以通过展开操作符(Spread operator)...扩展一个数组对象和字符串。展开运算符(spread)是三个点(…),可以将可迭代对象转为用逗号分隔的参数序列。如同rest参数的逆运算。 用于数组 以数组为例,首先创建一个数组, 代码语言:txt AI代码...
Spread operation in function calls No support 46 27.0 (27) No support No support 8 46 Spread operation in destructuring No support No support 34 (34) ? ? ? No support See also Rest parameters Document Tags and Contributors Tags: ECMAScript6 Iterator JavaScript operator Operator Contributors ...
In short: The spread operatormakes deep copies of data if the data is not nested. When you have nested data in an array or object the spread operator will create a deep copy of the topmost data and a shallow copy of the nested data. Shallow Copy:Ashallow copyof an object is a copy ...
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JavaScript operator: Spread syntax (...) Global usage 95.23% + 0% = 95.23% IE ❌ 6 - 10: Not supported ❌ 11: Not supported Edge ✅ 12 - 135: Supported ✅ 136: Supported Firefox ❌ 2 - 15: Not supported ✅ 16 - 137: Supported ✅ 138: Supported ✅ 139 - 141: ...
Since spread operator states to consider any after three dots as array if it fits the construct. so {...false} does almost what happens to b in below example. It remains an empty object WHY because objects need key value paring. a = [1,2,3]; b={1,2,3}; console.log(a[1]); ...
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When merging 2 objects together with the spread operator, it is assumed another iterating function is used when the merging occurs.Spread syntax (other than in the case of spread properties) can be applied only to iterable objects:const obj = {'key1': 'value1'}; const array = [...obj...
还有一种操作符叫做剩余操作符(the rest operator),它的样子看起来和展开操作符一样,但是它是用于解构数组和对象。在某种程度上,剩余元素和展开元素相反,展开元素会“展开”数组变成多个元素,剩余元素会收集多个元素和“压缩”成一个单一的元素。 规范 规范状态备注 ...