Typescript - 将 Map 转换为逗号分隔的字符串

Question

I have a map that I'm converting a specific string format using:

let content = "";
let myMap = new Map().set('a', 1).set('b', 2).set('c', 3);

myMap.forEach((value: string, key: number) => {
   content += `${key}: ${value}, `;
});

However this will leave a comma at the end.

Is there some other way? eg to be able to use join ?

Thanks,

Answer 1

This works:

Object.keys(myMap).map(data => [data, myMap[data]]).map(([k, v]) => `${k}:${v}`).join(', ');

Answer 2

You can convert the map to an array, and then use join after a quick transformation:

 let myMap = new Map().set('a', 1).set('b', 2).set('c', 3); let str = [...myMap].map(([k, v]) => `${k}: ${v}`).join(", "); console.log(str);

Answer 3

Yes, you can use join

let content = []; // array
let myMap = new Map().set('a', 1).set('b', 2).set('c', 3);

myMap.forEach((value, key) => {
   content.push(`${key}: ${value}`); // push all elts into the array
});

content is now an array ["a: 1", "b: 2", "c: 3"]

use join to convert it to a comma separated string

content = content.join(); 

desired output "a: 1,b: 2,c: 3"