CODEWITHSUNDEEP
javascripttypescriptdata-structures
merry-go-round
merry-go-round

Reputation: 4615

Check data type from string input in JavaScript

I'm trying to get the DataType(?) from string input value.

const data = ['1', 'hello', '[]', '{key: [value]}', '`2020-10-08`'];

function funct(data: string): DataType {
    if(??) {
        return Object
    } else if(??) {
        return Number
    } else if(??) {
        return Array
    } else if (??) {
        return Date
    }
    return String
}

data.map((d) => console.log(funct(data)));
// Number, String, Array, Object, Data

function funct(d) {
    if(d.startsWith('{') && d.endsWith('}')) {
        return typeof {}
    } else if(d.indexOf('-') !== -1 && !isNaN(Date.parse(d))) {
        return 'Date';
    } else if(!isNaN(parseFloat(d))) {
        return typeof 1
    } else if(d.startsWith('[') && d.endsWith(']')) {
        return typeof []
    } else return typeof 'string'
}
console.log('number', funct('1'));
console.log('number', funct('123'));
console.log('string', funct('`as2d`'));
console.log('string', funct('2s2d'));
console.log('Object', funct('{}'));
console.log('Array', funct('[]')); //object :( 
console.log('Array', funct('["d", "f"]')); //object :(

Upvotes: 0

Views: 1007

Answers (1)

Abrar Hossain
Abrar Hossain

Reputation: 2702

You can try something like this:

function funct(d) {
    
    if(d.startsWith('{') && d.endsWith('}')) {
        return Object
    } else if(d.indexOf('-') !== -1 && !isNaN(Date.parse(d))) {
        return Date;
    } else if(!isNaN(parseFloat(d))) {
        return Number
    } else if(d.startsWith('[') && d.endsWith(']')) {
        return Array
    } else return String
}

Note: this was tested in JS so, I removed the type annotations. Please them if you want to compile it in TypeScript.

Upvotes: 1

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