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This article will explain in detail how javascript converts objects into arrays. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Conversion methods: 1, define an empty array; 2, use the "for (let i in obj) {}" statement to traverse the object; 3, in the loop body, use the push () function to store the object elements in the array, the syntax "let o = []; o [I] = obj [I]; arr.push (o);".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

For example, how to convert an object {'unfinished': 5, 'completed': 8,'to be confirmed': 4, 'cancelled': 6} to [{"unfinished": 5}, {"completed": 8}, {"to be confirmed": 4}, {"cancelled": 6}].

Two ways to take the value of an object

As we all know, there are two ways to take values for objects in JS, through the. Add the value of the attribute name directly after it, which is one of the most common ways we use, for example:

Let obj = {name: 'yang'}; console.log (obj.name); / / yang

This is the most common way, and another way we don't use much is to use [] to wrap the value of the property name, similar to an array, for example:

Let obj = {name: 'yang'}; console.log (obj [' name']); / / yang

One thing to note here is that the brackets are either variables or strings.

So what's the difference between the two before? for a known object, there's almost no difference.

Convert objects to arrays

First of all, let's look at our example.

Let obj = {'incomplete': 5, 'completed': 8,'to be confirmed': 4, 'cancelled': 6}; / / convert obj to [{"uncompleted": 5}, {"completed": 8}, {"to be confirmed": 4}, {"cancelled": 6}]

1. The target array is just to get the collection of key or value of the object.

Var arr = []; for (let i in obj) {arr.push (I); / / key / / arr.push (obj [I]); / / value} console.log (arr)

2. If you convert it to an array object according to the example we mentioned earlier, you only need to change the content in push to an object.

Var arr = []; for (let i in obj) {let o = []; o [I] = obj [I]; arr.push (o);} console.log (arr)

Finally, let's talk about for (let i in obj) {}, this method is mainly used to traverse the object, in is followed by the object, I is key.

This is the end of the article on "how javascript converts objects into arrays". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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