I am trying to check if the string is null or empty. If it is null or empty, then trying to assign default value as '1'. I tried below but it does not work.
var url = 'http://www.test.com?';
var concatResult = url +
"&firstname=" + viewer[1] ? viewer[1] : '1' +
"&tableId=" + this.id ? this.id : '1';
The output of concatResult is empty "" which should not be empty.
I would really appreciate your help. Thank you!
You need to wrap it in parenthesis:
(viewer[1] ? viewer[1] : '1')
Otherwise it is doing
(url + "&firstname=" + viewer[1]) ? viewer[1] : '1'
So all together:
var concatResult = url +
"&firstname=" + (viewer[1] ? viewer[1] : '1') +
"&tableId=" + (this.id ? this.id : '1');
Or a little shorter:
var concatResult = url +
"&firstname=" + (viewer[1] || '1') +
"&tableId=" + (this.id || '1');
var url = 'http://www.test.com?';
var concatResult = url +
"&firstname=" + (viewer[1] || '1') +
"&tableId=" + (this.id || '1');
You can use Nullish_coalescing_operator (?? and .?) or good old fashion or (||):
var viewer = null
var id = ''
var url = 'http://www.test.com?';
var concatResult = url +
"firstname=" + (viewer?.[1] || '1') +
"&tableId=" + (id || '1')
console.log(concatResult)this is working, no need to use + signs and quotes, just use template strings (Template literals)
const viewer = []
const id = ""
const url = 'http://www.test.com?';
const concatResult = `${url}&firstname=${viewer[1] || 1}&tableId=${id || 1}`;
