Learn a few advanced reduction patterns: flatten allows you to merge a set of arrays into a single array, the dreaded flatmap allows you to convert an array of objects into an array of arrays which then get fla
How do you flatten array in javascript If you are given an array that contains literals, arrays and objects and you want to get all the values to one array. Here is the snippet using recursive function to attain that. functionimplode(arr){varres = [];for(vari =0; i < arr.length ;...
Learn a few advanced reduction patterns: flatten allows you to merge a set of arrays into a single array, the dreaded flatmap allows you to convert an array of objects into an array of arrays which then get flattened, and reduceRight allows you to invert the order in which your reducer is...
var array = [1, '哈哈',3,'haha', 5]; array.indexOf('哈哈'); // 1 从第一个开始找'哈哈',找到后,返回'哈哈'索引为1 array.indexOf(7); // -1 从第一个开始找 7,没找到,返回 -1 array.indexOf(1, 1); // -1 从第二个开始找 1,没找到,返回 -1 array.indexOf(1, 0) // 0 ...
function flatten(input){ var output={};function recursion(key,value){ if(typeof value=="object"&&value!==null){ for(var k in value){ recursion(key+(isNaN(k)?(key?"."+k:k):"["+k+"]"),value[k]);} }else{ output[key]=value;} } recursion("",input);return output...
log(flattenedArray); 这段代码中,flattenObject函数使用了递归来遍历嵌套的对象。对于非对象类型的属性,直接将其添加到结果对象中;对于数组类型的属性,遍历数组元素并递归调用flattenObject函数;对于对象类型的属性,遍历对象的属性并递归调用flattenObject函数。 以上代码的输出结果为: 代码语言:txt 复制 { "a": 1...
要拍平的数组returnfunctionflatten(arr){// 3、循环数组,判断每一项,不为输的话将其塞入newarr// 若为数组,递归调用 faltten,并将结果与newarr合并for(vartofarr){if(!Array.isArray(t)){newarr.push(t);}else{newarr.concat(flatten(t))}}returnnewarr}}varflatten=product();console.log(flatten(arr...
请使用 JavaScript 实现名为 flatten(input) 的函数,可以将传入的 input 对象(Object 或者 Array)进行扁平化处理并返回结果。具体效果如下: const input = { a: 1, b: [ 1, 2, { c: true }, [ 3 ] ], d: { e: 2, f: 3 }, g: null, ...
array = array.concat(this.flatten(group[i])); }else{ array = array.concat(group[i]); } } return array; } 在if(group[i] instanceof Array) 的时候,调用函数自身,通过传参数的形式进行递归。只是在重构 Array.js 的时候,就觉得既然是框架,那么多抽象出来的东西不用,是不是太浪费了。所以,最好调...
❮PreviousJavaScript ArrayReferenceNext❯ Examples Create a new array with the sub-array elements concatenated: constmyArr = [[1,2],[3,4],[5,6]]; constnewArr = myArr.flat(); Try it Yourself » constmyArr = [1,2, [3, [4,5,6],7],8]; ...