filter is not a function
时间: 2023-11-24 10:07:11 浏览: 57
This error message usually occurs when you try to use the `filter` method on a variable that is not an array. The `filter` method is only available for arrays, so if you try to use it on a string, number, or object, you will receive this error.
For example, if you have a variable `x` that is a string and you try to use the `filter` method on it like this:
```
const x = "hello world";
const filtered = x.filter(char => char === "l");
```
You will get the error message "TypeError: x.filter is not a function" because `x` is not an array.
To fix this error, make sure that you are using the `filter` method on an array. If you are not sure whether your variable is an array or not, you can use the `Array.isArray()` method to check:
```
if (Array.isArray(x)) {
const filtered = x.filter(item => item > 5);
}
```
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