JavaScript 将字符串转换为数组 Object

Question

How do I convert string to array object.

I have string

let colors = "[red, blue, green]"

and would like to convert as

String[] colors = ["red", "blue", "green"]

Is there any inbuilt functions available for this conversion?

Thank you for looking into it.

Answer 1

I would follow @Jannes Carpentier 's approach - but to givae an alternative - you can use slice to get the text (non-brackets) portion of the string and then split on the " , " to get an array of the text items and then re-assign it to the original variable.

 let colors = "[red, blue, green]" colors = colors.slice(1,-1).split(', '); console.log(colors); // gives ["red", "blue", "green"]

Answer 2

First remove the brackets

Then split on ", "

 let colors = "[red, blue, green]" colors = colors.replace(/([\[\]])/g, ""); colors = colors.split(", "); console.log(colors);

Instead of replacing all [ ] you could also remove the first and last character from the string

And then split on ", "

 let colors = "[red, blue, green]" colors = colors.substring(1, colors.length - 1); colors = colors.split(", "); console.log(colors);

Answer 3

If your data isn't formatted in any common standard, you are unlikely to find a prebuilt data parser. If you have control over the input string, it would be better to format it as a json string as follows: '["red", "green", "blue"]' Then you can easily take it apart with JSON.parse().

The other two answers have very satisfactory parsers for your data, however, I prefer not to count on the existence of whitespace in my input. A parser such as

function customParse(data) {
  return data
    .substring(1, data.length -1)
    .split(",", data)
    .map(trim);
}

console.log(customParse("[red, blue,green]"));

will work regardless of whitespace.