CODEWITHSUNDEEP
javascript
Felicity
Felicity

Reputation: 43

Leading "000" input in Javascript

parseInt("09", 10) // 9 in this way it will just remove the leading 0

but i want to create a program that if the user input a number with leading zeros , the output will be invalid

Upvotes: 0

Views: 334

Answers (2)

kennebec
kennebec

Reputation: 104790

// You can validate '0', '0.2' or '2.00' with this regular expression:

function validDigits(str){
   return /^(0|[1-9]\d*)(\.\d+)?$/.test(str)? 'valid':false;
}

//test:

['100', '1.0','0.5','05','0','2.0','002','2.00'].map(function(itm){
return itm+': '+ validDigits(itm);
}).join('\n')

/*  returned value: (String)
100: valid
1.0: valid
0.5: valid
05: false
0: valid
2.0: valid
002: false
2.00: valid
*/

Upvotes: 1

Matt Kenefick
Matt Kenefick

Reputation: 1206

function test(input) {
    return !/^0.*[0-9]/.test(input);
}

// false
console.log( test("01") );

// true
console.log( test("1") );

// false
console.log( test("00") );

// true
console.log( test("0") );

Upvotes: 1

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