How to convert array to object in es6
Conversion method: 1. Use the fromEntries() and map() functions, the syntax "Object.fromEntries(arr.map(item => [item.key, item]))" statement; 2. Use Spread operator "...", syntax "{...arr}".
The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.
Method to convert array to object in es6
Method 1: Using fromEntries() and map() functions
const arr = [ { key: "id", name: "编号" }, { key: "name", name: "名称" }, ]; const obj = Object.fromEntries(arr.map(item => [item.key, item])); console.log(obj);
Output
Method 2: Use the spread operator "..."
const arr = [ { key: "id", name: "编号" }, { key: "name", name: "名称" }, ]; const obj = {...arr} ; console.log(obj);
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async is es7. async and await are new additions to ES7 and are solutions for asynchronous operations; async/await can be said to be syntactic sugar for co modules and generator functions, solving js asynchronous code with clearer semantics. As the name suggests, async means "asynchronous". Async is used to declare that a function is asynchronous; there is a strict rule between async and await. Both cannot be separated from each other, and await can only be written in async functions.

In ES6, you can use the reverse() method of the array object to achieve array reversal. This method is used to reverse the order of the elements in the array, putting the last element first and the first element last. The syntax "array.reverse()". The reverse() method will modify the original array. If you do not want to modify it, you need to use it with the expansion operator "...", and the syntax is "[...array].reverse()".

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Steps: 1. Convert the two arrays to set types respectively, with the syntax "newA=new Set(a);newB=new Set(b);"; 2. Use has() and filter() to find the difference set, with the syntax " new Set([...newA].filter(x =>!newB.has(x)))", the difference set elements will be included in a set collection and returned; 3. Use Array.from to convert the set into an array Type, syntax "Array.from(collection)".

In es5, you can use the for statement and indexOf() function to achieve array deduplication. The syntax "for(i=0;i<array length;i++){a=newArr.indexOf(arr[i]);if(a== -1){...}}". In es6, you can use the spread operator, Array.from() and Set to remove duplication; you need to first convert the array into a Set object to remove duplication, and then use the spread operator or the Array.from() function to convert the Set object back to an array. Just group.

How to convert PHP array to object: use stdClass class, use json_decode() function, use third-party library (such as ArrayObject class, Hydrator library)

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Alternatives to converting arrays to objects in PHP are: type cast: for example $obj=(object)$arr; using a custom class: define a class and assign values to properties through the constructor, for example newPerson($arr); use Third-party library: such as the Inflector::toObject() method provided by Doctrine\Common\Inflector\Inflector.
