query: How to make 0 not equal to empty string in JavaScript
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negative_passages.text: How to check whether a string contains a substring in JavaScript?
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negative_passages.text: How to format a Java string with leading zero?
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negative_passages.text: How to remove leading and trailing zeros in a string? Python
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negative_passages.text: Proper way to detect empty/blank text
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negative_passages.text: Difference between == and === in JavaScript
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negative_passages.text: How do I compare strings in Java?
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negative_passages.text: What is the best way to test for an empty string with jquery-out-of-the-box?
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negative_passages.text: Number with leading zero in JavaScript