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...
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 ;...
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 ...
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...
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...
array if (Array.isArray(a[i])) { // Recursively flatten nested arrays flatten(a[i], shallow, r); } else { // If the current element is not an array, push it to the result array r.push(a[i]); } } // Return the flattened array return r; }; // Output the result of the...
利用indexOf去重 functionunique(arr){if(!Array.isArray(arr)) { console.log("type error!");return; }vararray= [];for(vari =0; i < arr.length; i++) {if(array.indexOf(arr[i]) === -1) {array.push(arr[i]); } }returnarray; ...
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...
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This post will discuss how to flatten an array in JavaScript... The Array.flat() function is a built-in function that returns a new array with all sub-array elements concatenated into it recursively up to a specified depth.