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js check if string is number

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If-dev answered on July 23, 2019 Popularity 10/10 Helpfulness 5/10

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js check if string is number

Comment

isNaN(num)         // returns true if the variable does NOT contain a valid number

isNaN(123)         // false
isNaN('123')       // false
isNaN('1e10000')   // false (This translates to Infinity, which is a number)
isNaN('foo')       // true
isNaN('10px')      // true

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Apr 08 2020

If-dev

0 Answers Avg Quality 2/10

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javascript check if string is number

Comment

// native returns true if the variable does NOT contain a valid number
isNaN(num)

// can be wrapped for making simple and readable
function isNumeric(num){
  return !isNaN(num)
}

isNumeric(123)         // true
isNumeric('123')       // true
isNumeric('1e10000')   // true (This translates to Infinity, which is a number)
isNumeric('foo')       // false
isNumeric('10px')      // false

Popularity 10/10 Helpfulness 10/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 02 2020

Scriper

0 Answers Avg Quality 2/10

if string has number javascript

Comment

str = "hello123!"
if(/\d/.test(str))
  console.log(str+" has a number.")

Popularity 10/10 Helpfulness 10/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 10 2021

Armandres

0 Answers Avg Quality 2/10

js is numeric

Comment

function isNumeric(num) {
    if (num === '' || num === null) {
        return false
    }
    return !isNaN(num)
}

isNumeric('') //false
isNumeric('7') //true
isNumeric(7) //true
isNumeric('7a') //false
isNumeric('a') //false
isNumeric(null) //false
isNumeric(0) //true
isNumeric('0') //true
isNumeric(true) //true
isNumeric(false) //true

Popularity 10/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 12 2022

Tiago F2

0 Answers Avg Quality 2/10

javascript check if string is number

Comment

if (typeof myVar === 'string'){
    //I am indeed a string
}

Popularity 10/10 Helpfulness 7/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 23 2019

Grepper

0 Answers Avg Quality 2/10

js check if string is integer

Comment

function isInt(str) {
  return !isNaN(str) && Number.isInteger(parseFloat(str));
}

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: integer

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Contributed on Jun 04 2020

TC5550

0 Answers Avg Quality 2/10

if string has number javascript

Comment

const str = "vikash123!";

const hasNumber = /\d/.test(str);
console.log(hasNumber) // true

Popularity 9/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 17 2022

Scriper

0 Answers Avg Quality 2/10

javascript check if string is number

Comment

function isNumeric(num){
  return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 25 2019

Grepper

0 Answers Avg Quality 2/10

javascript check if number

Comment

function isNumber(value) {
  return !isNaN(value) && parseFloat(Number(value)) === value && !isNaN(parseInt(value, 10));
}

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 18 2022

Matteoweb

0 Answers Avg Quality 2/10

js check if a string is a number

Comment

function isNumeric(str) {
  if (typeof str != "string") return false // we only process strings!  
  return !isNaN(str) && // use type coercion to parse the _entirety_ of the string (`parseFloat` alone does not do this)...
         !isNaN(parseFloat(str)) // ...and ensure strings of whitespace fail
}

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jan 20 2022

Ang is wolf dude (ang)

0 Answers Avg Quality 2/10

js check if string is number

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