CODEWITHSUNDEEP
javascript
reactdto2
reactdto2

Reputation: 123

Delete part of the string to the character encountered javascript

I would need to write a js function that would do this to me:

export const LOGIN_REQUEST = 'app/LoginPage/LOGIN_REQUEST';

Normally it will be:

console.log(LOGIN_REQUEST); // app/LoginPage/LOGIN_REQUEST

And I would need:

app/LoginPage/LOGIN

I would like to cut the string to the first one I encountered _. How to do it using js?

Upvotes: 1

Views: 35

Answers (3)

Gaurav Tyagi
Gaurav Tyagi

Reputation: 689

In Javascript, you can use the split function.

var data = "app/LoginPage/LOGIN_REQUEST".split("_");
console.log(data[0]); // app/LoginPage/LOGIN

Upvotes: 0

Majed Badawi
Majed Badawi

Reputation: 28404

You get the index of this character using indexOf method, and then take the substring before its first occurrence using the substring method as follows:

let LOGIN_REQUEST = 'app/LoginPage/LOGIN_REQUEST';
let i = LOGIN_REQUEST.indexOf('_');
let str = (i==-1) ? LOGIN_REQUEST : LOGIN_REQUEST.substring(0,i);
console.log(str);

Upvotes: 0

Simon Lutterbie
Simon Lutterbie

Reputation: 167

LOGIN_REQUEST.split('_')[0]

Splits LOGIN_REQUEST into an array of strings, divided by _, and returns the first element of the Array. So, everything up to the first _.

More fully:

const LOGIN_REQUEST = 'app/LoginPage/LOGIN_REQUEST';

console.log(LOGIN_REQUEST.split(`_`)) // ['app/LoginPage/LOGIN', 'REQUEST']

console.log(LOGIN_REQUEST.split(`_`)[0]) // 'app/LoginPage/LOGIN'

Upvotes: 1

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