In TypeScript, the String.Format method does not exist, leading to the error. How to fix this?

General Discussions
1

In TypeScript, the String.Format method does not exist, leading to the error:

The property ‘format’ does not exist on value of type

 '{ prototype: String; fromCharCode(...codes: number[]): string; 
 (value?: any): string; new(value?: any): String; }'.

Given the following code snippet:

attributes["Title"] = String.format(
    Settings.labelKeyValuePhraseCollection["[WAIT DAYS]"],
    originalAttributes.Days
);
2

Hi Mehta,

Template literals are a powerful way to format strings in TypeScript. They provide an easy and readable way to include variables and expressions within a string.

attributes[“Title”] = ${Settings.labelKeyValuePhraseCollection["[WAIT DAYS]"]} ${originalAttributes.Days};

3

If you need more control or need to replace placeholders within a string, you can create a custom format function. This function replaces placeholders in the template string with the provided values.

function formatString(template: string, ...values: any[]): string {
    return template.replace(/{(\d+)}/g, (match, index) => 
        typeof values[index] != 'undefined' ? values[index] : match
    );
}

attributes["Title"] = formatString(
    Settings.labelKeyValuePhraseCollection["[WAIT DAYS]"],
    originalAttributes.Days
);