How to remove/add the colon in javascript

Question

How to change the time depending on value in javascript if it has colon, remove the colon and should be integer format if it has no colon, add the colon in javascript

function checkColon(str) {
  return str.replace(/:/g, '');

}
var t1 = "10:40"
var t2 = "01:40"
var t3 = "0240"
var t4 = "1250"
console.log(this.checkColon(t1), this.checkColon(t2), this.checkColon(t3), this.checkColon(t4));

Expected Output:

I made you a snippet. Your numbers need to be strings so I wrapped them in " — mplungjan
– mplungjan, Commented Sep 4, 2020 at 8:00

hgb123 · Accepted Answer · 2020-09-04 08:03:39Z

2

You could use replace by regex group for the case when string does not have colon

function checkColon(str) {
  if (str.includes(':')) {
    return str.replace(/:/g, '')
  } else {
    return str.replace(/(\d{2})(\d{2})/g, '$1:$2')
  }
}

function checkColon(str) {
  if (str.includes(':')) {
    return str.replace(/:/g, '')
  } else {
    return str.replace(/(\d{2})(\d{2})/g, '$1:$2')
  }
}

var t1 = '10:40'
var t2 = '01:40'
var t3 = '0240'
var t4 = '1250'

console.log(checkColon(t1), checkColon(t2), checkColon(t3), checkColon(t4))

answered Sep 4, 2020 at 8:03

hgb123

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Comments

Nitheesh · Accepted Answer · 2020-09-04 08:04:30Z

0

Hope this works for you

function checkColon(str){
  if (str.indexOf(':') > -1) {
    return str.replace(/:/g,'');
  } else {
    return [str.slice(0, 2), ':', str.slice(2)].join('');
  }

}
var t1= '10:40';
var t2= '01:40';
var t3= '0240';
var t4= '1250';
console.log(checkColon(t1), checkColon(t2), checkColon(t3), checkColon(t4));

answered Sep 4, 2020 at 8:04

Nitheesh

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Comments

User863 · Accepted Answer · 2020-09-04 08:04:36Z

0

Using replacer method

Regex Demo

function checkColon(str) {
  return str.replace(/(?<=\d\d)(:)?(?=\d\d)/g, (m, p) => p ? '' : ':');
}

var t1 = "10:40"
var t2 = "01:40"
var t3 = "0240"
var t4 = "1250"

console.log(this.checkColon(t1), this.checkColon(t2), this.checkColon(t3), this.checkColon(t4));

answered Sep 4, 2020 at 8:04

User863

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Comments

brk · Accepted Answer · 2020-09-04 08:07:03Z

0

Inside checkColon check if the string contains : if so , then replace it or else add it using substr

function checkColon(str) {
  if (str.indexOf(':') !== -1) {
    return str.replace(/:/g, '');
  } else {
    return `${str.substr(0,1)}:${str.substr(2,str.length)}`
  }


}
var t1 = "10:40"
var t2 = "01:40"
var t3 = "0240"
var t4 = "1250"
console.log(this.checkColon(t1), this.checkColon(t2), this.checkColon(t3), this.checkColon(t4));

answered Sep 4, 2020 at 8:07

brk

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Comments

Sascha A. · Accepted Answer · 2020-09-04 08:08:10Z

0

Check with includes if colon is in string. Delete it with replace or add it to the with substr partetd string.

function checkColon(str) {
  return (str.includes(':')) ? str.replace(/:/g, '') : str.substr(0,2) + ':' +  str.substr(2);

}
var t1 = "10:40"
var t2 = "01:40"
var t3 = "0240"
var t4 = "1250"
console.log(this.checkColon(t1), this.checkColon(t2), this.checkColon(t3), this.checkColon(t4));

answered Sep 4, 2020 at 8:08

Sascha A.

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Comments

mplungjan · Accepted Answer · 2020-09-04 08:19:39Z

0

Not sure I understand the usecase but try this

const checkColon =  str => {
   if (str.includes(":")) return str.replace(/:/g, '');
   let arr = str.split(""); 
   arr.splice(2,0,":");
   return arr.join("");
};   

const t1 = "10:40";
const t2 = "01:40";
const t3 = "0240";
const t4 = "1250";
console.log(checkColon(t1), checkColon(t2), checkColon(t3), checkColon(t4));

edited Sep 4, 2020 at 8:19

answered Sep 4, 2020 at 8:04

mplungjan

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