How to Convert Typescript Dictionary to String ?
Last Updated :
07 Aug, 2024
In TypeScript, dictionaries are often represented as the objects where keys are associated with the specific values. Converting a TypeScript dictionary to a string is an important task when doing API calls where we cast the JSON response from the API to a string.
Below are the ways to convert a TypeScript dictionary to a string:
Using JSON.stringify() method
Since TypeScript is a superset of JavaScript, it also provides the JSON.stringify() method to convert a JavaScript object into a JSON string. It is the easiest and most concise way to convert a TypeScript dictionary to a string.
Syntax
let dictString: string = JSON.stringify(dictionary);
Example: The below code uses JSON.stringify() method to convert the TypeScript dictionary to a string.
JavaScript
interface Dictionary {
[key: string]: string;
}
let dictionary: Dictionary = {
name: "geeksforgeeks",
desc: "A computer science portal",
est: "2009",
};
let dictString: string =
JSON.stringify(dictionary);
console.log(dictString);
Output:
"{"name":"geeksforgeeks","desc":"A computer science portal","est":"2009"}"
Using a custom function
In this approach, we use the Object.entries() method along with a for-loop to convert a dictionary to a string. The Object.entries() method is used to extract the key-value pairs from an object. Here, we create a custom function to iterate through the key-value pairs of the dictionary and formatting each key-value pair into a string.
Syntax
function dictionaryToString(dictionary: Dictionary): string {
return Object.entries(dictionary)
.map(([key, value]) => `${key}: ${value}`)
.join(', ');
}
Example: The below code uses a custom function to convert the TypeScript dictionary to a string.
JavaScript
interface Dictionary {
[key: string]: string;
}
function dictionaryToString(
dictionary: Dictionary
): string {
return Object.entries(dictionary)
.map(([key, value]) => `${key}: ${value}`)
.join(", ");
}
let dictionary: Dictionary = {
name: "geeksforgeeks",
desc: "A computer science portal",
est: "2009",
};
let dictString: string =
dictionaryToString(dictionary);
console.log(dictString);
Output:
"name: geeksforgeeks, desc: A computer science portal, est: 2009"
Using Object.keys() and Array.prototype.map()
In this approach we are using Object.keys() and Array.prototype.map() to iterate over dictionary keys, constructing an array of key-value pairs formatted as strings. This approach efficiently converts a TypeScript dictionary to a string representation.
Syntax:
function dictionaryToString(dictionary: Dictionary): string {
return Object.keys(dictionary)
.map(key => `${key}: ${dictionary[key]}`)
.join(', ');
}
Example: In this example we defines a function dictionaryToString to convert a TypeScript dictionary to a string using Object.keys() and Array.prototype.map(), then logs the result.
JavaScript
interface Dictionary {
[key: string]: string;
}
function dictionaryToString(dictionary: Dictionary): string {
return Object.keys(dictionary)
.map(key => `${key}: ${dictionary[key]}`)
.join(', ');
}
let dictionary: Dictionary = {
"name": "geeksforgeeks",
"desc": "A computer science portal",
"est": "2009"
};
let dictString: string = dictionaryToString(dictionary);
console.log(dictString);
Output:
"name: geeksforgeeks, desc: A computer science portal, est: 2009"
Using Template Literals
In this approach, we use template literals to convert a TypeScript dictionary to a string. Template literals provide an elegant and readable way to format strings, making the conversion process straightforward.
Syntax:
function dictionaryToString(dictionary: Dictionary): string {
return `{ ${Object.entries(dictionary)
.map(([key, value]) => `${key}: ${value}`)
.join(', ')} }`;
}
Example: The following example demonstrates how to use template literals to convert a TypeScript dictionary to a string.
JavaScript
interface Dictionary {
[key: string]: string;
}
function dictionaryToString(dictionary: Dictionary): string {
return `{ ${Object.entries(dictionary)
.map(([key, value]) => `${key}: ${value}`)
.join(', ')} }`;
}
let dictionary: Dictionary = {
name: "geeksforgeeks",
desc: "A computer science portal",
est: "2009",
};
let dictString: string = dictionaryToString(dictionary);
console.log(dictString);
Output:
{ name: geeksforgeeks, desc: A computer science portal, est: 2009 }
Using URLSearchParams
In this approach, we utilize the URLSearchParams API to convert a TypeScript dictionary to a query string-like format. This method is particularly useful when preparing data for URL query parameters or form submissions.
Example: The following example demonstrates how to use URLSearchParams to convert a TypeScript dictionary to a string.
JavaScript
interface Dictionary {
[key: string]: string;
}
function dictionaryToQueryString(dictionary: Dictionary): string {
const params = new URLSearchParams(dictionary);
return params.toString();
}
const dictionary: Dictionary = {
name: "geeksforgeeks",
desc: "A computer science portal",
est: "2009"
};
const queryString = dictionaryToQueryString(dictionary);
console.log(queryString);
Output
name=geeksforgeeks&desc=A+computer+science+portal&est=2009
Using Object.entries() and reduce() Method
In this approach, we use the Object.entries() method to get an array of key-value pairs from the dictionary and then use the reduce() method to concatenate these pairs into a single string.
Syntax:
function dictionaryToString(dictionary: Dictionary): string {
return Object.entries(dictionary)
.reduce((acc, [key, value]) => `${acc}${key}: ${value}, `, "")
.slice(0, -2); // Remove the trailing comma and space
}
Example: In this example, we use the reduce() method to accumulate the key-value pairs into a single string, separated by commas.
JavaScript
interface Dictionary {
[key: string]: string;
}
function dictionaryToString(dictionary: Dictionary): string {
return Object.entries(dictionary)
.reduce((acc, [key, value]) => `${acc}${key}: ${value}, `, "")
.slice(0, -2); // Remove the trailing comma and space
}
let dictionary: Dictionary = {
name: "geeksforgeeks",
desc: "A computer science portal",
est: "2009",
};
let dictString: string = dictionaryToString(dictionary);
console.log(dictString);
Outputname: geeksforgeeks, desc: A computer science portal, est: 2009
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