How to assign function to object property in typescript?

Question

I have simple use case where i want to validate date input it should be in the format "YYYY/MM/DD" if anything other format passed throw error so question how can i assign function to object property in typescript ?

main.ts

const ValidateRuless = [

    {element: "date", values: this.validateDate()}

];

function validateDate(date: string) {
    const date_regex =  /^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/ ;
    if (!(date_regex.test(date))) {
        return false;
    }
}

Ryan Cavanaugh · Accepted Answer · 2018-05-17 16:49:30Z

4

To call a function, don't use this.functionName. Only use this. when calling methods of classes.

You probably also want to return a value in both cases in validateDate

Example:

const ValidateRuless = [

    {element: "date", values: validateDate("2018/05/17")}

];

function validateDate(date: string) {
    const date_regex =  /^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/ ;
    if (!(date_regex.test(date))) {
        return false;
    } else {
        return true;
    }
}

answered May 17, 2018 at 16:49

Ryan Cavanaugh

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2 Comments

hussain Over a year ago

yyyy/mm/dd this is the correct format but its not taking it always return false

Ryan Cavanaugh Over a year ago

Debugging your regexp would be a different question

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