Javascript 根据javascript中的索引将数组拆分为两个
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split an array into two based on a index in javascript
提问by user811433
I have an array with a list of objects. I want to split this array at one particular index, say 4 (this in real is a variable). I want to store the second part of the split array into another array. Might be simple, but I am unable to think of a nice way to do this.
我有一个包含对象列表的数组。我想在一个特定的索引处拆分这个数组，比如说 4（这实际上是一个变量）。我想将拆分数组的第二部分存储到另一个数组中。可能很简单，但我想不出一个很好的方法来做到这一点。
回答by TJHeuvel
回答by Mark Amery
You can use Array@spliceto chop all elements after a specified index off the end of the array and return them:
您可以使用Array@splice在数组末尾的指定索引之后截断所有元素并返回它们：
x = ["a", "b", "c", "d", "e", "f", "g"];
y = x.splice(3);
console.log(x); // ["a", "b", "c"]
console.log(y); // ["d", "e", "f", "g"]
回答by mamoo
回答by Mustkeem K
I would recommend to use slice() like below
我建议使用 slice() 如下所示
ar.slice(startIndex,length);or
ar.slice(startIndex);
ar.slice(startIndex,length);或者
ar.slice(startIndex);
var ar = ["a","b","c","d","e","f","g"];
var p1 = ar.slice(0,3);
var p2 = ar.slice(3);
console.log(p1);
console.log(p2);回答by masterspambot
You can also use underscore/lodash wrapper:
您还可以使用下划线/lodash 包装器：
var ar = [1,2,3,4,5,6];
var p1 = _.first(ar, 4);
var p2 = _.rest(ar, 4);
回答by Micha? Wojas
Simple one function from lodash:
const mainArr = [1,2,3,4,5,6,7]
const [arr1, arr2] = _.chunk(mainArr, _.round(mainArr.length / 2));
来自 lodash 的一个简单函数：
const mainArr = [1,2,3,4,5,6,7]
const [arr1, arr2] = _.chunk(mainArr, _.round(mainArr.length / 2));
