jq：限制复杂 json 中的所有数组
尝试以下代码：
echo '["a","b","c","d","e"]' | jq '..|= if type == "array" then [limit(3;.[])] else . end'
[
"a",
"b",
"c",
null,
null
]
期望它生成短数组：
[
"a",
"b",
"c"
]
我使用的 JSON 又大又复杂。我的目标是将所有数组缩小到长度 3。我得到的是原始长度的数组，其中有很多空值。
有想法吗？
Trying the following code:
echo '["a","b","c","d","e"]' | jq '..|= if type == "array" then [limit(3;.[])] else . end'
[
"a",
"b",
"c",
null,
null
]
Expect it to produce short array:
[
"a",
"b",
"c"
]
JSONs I work with are big and complex. My goal is to shrink all arrays down to length 3. What I get is arrays of original length with lots of nulls.
Ideas?
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如果整体结构可能很复杂，但数组的数量和排列并不复杂（例如，没有数组本身是位置高于 3 的另一个数组的项等），则可以简单地寻址“所有数组”并缩短它们彼此独立：
但是，如果您需要涵盖这些特殊情况，则
walk会更合适，因为它按顺序沿文档树下降，因此在截断后不会留下悬空部分：If while the overall structure may be complex, the amount and arrangement of the arrays are not (e.g. no array is itself an item of another array at a position higher than 3, etc), you can simply address "all arrays" and shorten them independently from each other:
If, however, you need to cover those special cases,
walkwould be more appropriate as it descends the document tree in order and therefore will not leave over dangling parts after the trucation: