英文:
How to remove the first element of an array in JSONata?
问题
要删除类似于以下内容的数组的第一个元素，可以使用以下方法：
{
"array":[
{
"item":"1"
},
{
"item":"2"
},
{
"item":"3"
}
]
}
期望的结果如下：
{
"array":[
{
"item":"2"
},
{
"item":"3"
}
]
}
英文:
How do I remove the first element of an array that looks like this:
{
"array":[
{
"item":"1"
},
{
"item":"2"
},
{
"item":"3"
}
]
}
I am expecting it to look like this:
{
"array":[
{
"item":"2"
},
{
"item":"3"
}
]
}
答案1
得分: 4
这可以通过$filter JSONata函数来实现：
{
"array": $filter(array, function ($v, $i) {
$i != 0
})
}
在JSONata playground中尝试它。
英文:
This can be accomplished via the $filter JSONata function:
{
"array": $filter(array, function ($v, $i) {
$i != 0
})
}
try it here: JSONata playground
(edited to nest the output under the array key per the example output in the question)
答案2
得分: 1
你可以使用 filter 运算符 与一个 绑定的位置变量 结合起来，如下所示进行过滤：
{ "array": array#$i[$i>0] }
在 playground 上查看：https://stedi.link/5hQYetH
英文:
You can use the filter operator combined with a bound positional variable like this to filter it:
{ "array": array#$i[$i>0] }
Check it out on the playground: https://stedi.link/5hQYetH
答案3
得分: 0
你可以使用 Array.prototype.shift()
const obj = {
"array": [
{
"item": "1"
},
{
"item": "2"
},
{
"item": "3"
}
]
};
const firstElement = obj.array.shift();
console.log(obj.array)
英文:
You can your Array.prototype.shift()
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const obj = {
"array":[
{
"item":"1"
},
{
"item":"2"
},
{
"item":"3"
}
]
};
const firstElement = obj.array.shift();
console.log(obj.array)
<!-- end snippet -->
答案4
得分: 0
const obj = {
"array": [
{
"item": "1"
},
{
"item": "2"
},
{
"item": "3"
}]
}
obj.array = obj.array.filter((item, index) => index !== 0);
console.log(obj)
英文:
You can use Array.prototype.filter()
const obj = {
"array":[
{
"item":"1"
},
{
"item":"2"
},
{
"item":"3"
}]}
obj.array = obj.array.filter((item , index) => index !== 0);
console.log(obj)
答案5
得分: 0
你可以使用展开运算符 ... 结合解构语法。第一个“空”逗号元素将被忽略，其余元素将被赋值给 newArray。
const data = {
"array": [
{
"item": "1"
},
{
"item": "2"
},
{
"item": "3"
}
]
};
const { array: [, ...newArray] } = data;
console.log(newArray);
请注意，这是一段JavaScript代码示例。
英文:
You can use destructuring syntax with spread operator .... The first "empty" comma element is ignored. The rest of elements are assigned to newArray
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const data = {
"array":[
{
"item":"1"
},
{
"item":"2"
},
{
"item":"3"
}
]
};
const { array: [, ...newArray] } = data;
console.log(newArray);
<!-- end snippet -->
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