I am getting this error if i use map in my script. How to resolve this error?
I am getting this error: Uncaught TypeError: Cannot read property 'map' of null
Js Script:
var stringval="global $1200";
var getVal=stringval.match(/\d+/g).map(Number);
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3it works fine buddy. Whats the error?Maheer Ali– Maheer Ali2019-02-06 12:50:47 +00:00Commented Feb 6, 2019 at 12:50
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Which version of ECMA-Script do you use?user6749601– user67496012019-02-06 12:51:27 +00:00Commented Feb 6, 2019 at 12:51
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Getting this error: Uncaught TypeError: Cannot read property 'map' of nullRojaS– RojaS2019-02-06 12:55:31 +00:00Commented Feb 6, 2019 at 12:55
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Please, be more specific. Which browser do you use? Which version of Javascript do you use? Without those setup information no one will be able to help you solve your problem.user6749601– user67496012019-02-06 12:57:48 +00:00Commented Feb 6, 2019 at 12:57
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@RojaS are you using any older version of IE browser? As your code works fine in current browser. Check link for more details. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…Atanu– Atanu2019-02-06 12:59:26 +00:00Commented Feb 6, 2019 at 12:59
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1 Answer
String.match return Array<string> | null.
- If match is found, an array of matched string will be returned.
- If no match is found,
nullwill be rendered.
So in you case, if the string does not have any number, it will return null causing the script to break.
Sample:
function getNumber(stringval) {
return stringval.match(/\d+/g).map(Number);
}
var stringval = "global $1200";
console.log(getNumber(stringval))
console.log(getNumber('Hello World'))A simple way to solve this is to add a check for existence of match:
function getNumber(stringval) {
// You can set any value based on your requirement
var defaultValue = undefined;
var matches = stringval.match(/\d+/g)
return matches !== null ? matches.map(Number) : defaultValue;
}
var stringval = "global $1200";
console.log(getNumber(stringval))
console.log(getNumber('Hello World'))
1 Comment
RojaS
Thank you very much