JavaScript's `indexOf` function can sometimes return false when it should actually return true

Question

JavaScript's `indexOf` function can sometimes return false when it should actually return true

I'm having trouble detecting if a specific text is present within a string. Even though the text I am looking for is clearly there, my code seems to ignore it and goes straight to the else part of the statement.

Here is the snippet of code causing the issue:

if (response.data.indexOf("Panelists sucessfully added Meeting ID") > 0) { < this check
    $scope.IsColor = true;
    $scope.Messages = response.data;
    angular.element("#msg").focus()
    return true;
}
else {
    $scope.IsColor = false;
    $scope.Messages = response.data;
    angular.element("#msg").focus()
    return false;
}

Here is the content of response.data:

response.data[0]: "Panelists successfully added Meeting ID: 94395753143 on 07/31/2020 at 01:53:17 PM"

Screenshot:

https://i.sstatic.net/f6Mdh.png

Could it be that indexOf is not suitable for checking if a value exists within a string in an array?

Any help or suggestions would be greatly appreciated.

Thank you, Erasmo

javascript angularjs string

Answer 1

Answer №1

const message = 'Panelists were successfully added to Meeting ID: 94395753143 on July 31, 2020 at 01:53:17 PM';

if (message.indexOf('Panelists were successfully added to Meeting ID') !== -1) {
    console.log(true);
} else {
    console.log(false);
}

Answer 2

const message = 'Panelists were successfully added to Meeting ID: 94395753143 on July 31, 2020 at 01:53:17 PM';

if (message.indexOf('Panelists were successfully added to Meeting ID') !== -1) {
    console.log(true);
} else {
    console.log(false);
}

JavaScript's `indexOf` function can sometimes return false when it should actually return true

Answer №1

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