我有一个JavaScript数组,如:
[["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]]
如何将单独的内部数组合并为一个,例如:
["$6", "$12", "$25", ...]
我有一个JavaScript数组,如:
[["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]]
如何将单独的内部数组合并为一个,例如:
["$6", "$12", "$25", ...]
当前回答
如果你使用lodash,你可以使用它的flatten方法:https://lodash.com/docs/4.17.14#flatten
lodash的优点是它还具有使数组变平的方法:
i) 递归地:https://lodash.com/docs/4.17.14#flattenDeep
ii)多达n层嵌套:https://lodash.com/docs/4.17.14#flattenDepth
例如
const _ = require("lodash");
const pancake = _.flatten(array)
其他回答
你可以使用Ramda JS flatten
var arr=[[1,2],[3],[4,5]];var flattedArray=R.flatten(arr);console.log(flattedArray)<script src=“https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.js“></script>
如果您的编码环境支持ES6(ES2015),那么您不需要编写任何递归函数或使用map、reduce等数组方法。
一个简单的排列运算符(…)将帮助您将一个数组展平为单个数组
eg:
const data = [[1, 2, 3], [4, 5],[2]]
let res = []
data.forEach(curSet=>{
res = [...res,...curSet]
})
console.log(res) //[1, 2, 3, 4, 5, 2]
以下代码将压平深度嵌套的数组:
/**
* [Function to flatten deeply nested array]
* @param {[type]} arr [The array to be flattened]
* @param {[type]} flattenedArr [The flattened array]
* @return {[type]} [The flattened array]
*/
function flattenDeepArray(arr, flattenedArr) {
let length = arr.length;
for(let i = 0; i < length; i++) {
if(Array.isArray(arr[i])) {
flattenDeepArray(arr[i], flattenedArr);
} else {
flattenedArr.push(arr[i]);
}
}
return flattenedArr;
}
let arr = [1, 2, [3, 4, 5], [6, 7]];
console.log(arr, '=>', flattenDeepArray(arr, [])); // [ 1, 2, [ 3, 4, 5 ], [ 6, 7 ] ] '=>' [ 1, 2, 3, 4, 5, 6, 7 ]
arr = [1, 2, [3, 4], [5, 6, [7, 8, [9, 10]]]];
console.log(arr, '=>', flattenDeepArray(arr, [])); // [ 1, 2, [ 3, 4 ], [ 5, 6, [ 7, 8, [Object] ] ] ] '=>' [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
在javascript中定义一个名为foo的数组数组,并使用javascript的arrayconcat内置方法将该数组展平为单个数组:
const foo = [["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]]
console.log({foo});
const bar = [].concat(...foo)
console.log({bar});
应打印:
{ foo:
[ [ '$6' ],
[ '$12' ],
[ '$25' ],
[ '$25' ],
[ '$18' ],
[ '$22' ],
[ '$10' ] ] }
{ bar: [ '$6', '$12', '$25', '$25', '$18', '$22', '$10' ] }
您可以使用array.prototype.reduce()和array.protocol.contat()展平数组
var data=[[“$6”],[“$12”],【“$25”】,[“$25“],【”$18”】,【”$22“】,【“$10”】,“$15”】、【”$3“】,[”$75“],[”$5“],“$100”]、【”$7“】、【“$3”】、“$75”],“$5”]]。reduce(函数(a,b){返回a.concat(b);}, []);console.log(数据);
相关文档:https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/concat
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce