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TypeScript - check if character is digit
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In this short article, we would like to show how to check if the character is a digit using TypeScript.
Quick solution:
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const DIGIT_EXPRESSION: RegExp = /^\d$/;2
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const isDigit = (character: string): boolean => {4
return character && DIGIT_EXPRESSION.test(character);5
};
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const DIGIT_EXPRESSION: RegExp = /^\d$/;2
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const isDigit = (character: string): boolean => {4
return character && DIGIT_EXPRESSION.test(character);5
};6
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// Usage example:9
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// digits11
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console.log(isDigit('0')); // true13
console.log(isDigit('5')); // true14
console.log(isDigit('9')); // true15
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// letters17
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console.log(isDigit('a')); // false19
console.log(isDigit('z')); // false20
console.log(isDigit('A')); // false21
console.log(isDigit('Z')); // false22
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// other24
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console.log(isDigit('10')); // false26
console.log(isDigit('ab')); // false27
console.log(isDigit('😎')); // false28
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console.log(isDigit('-')); // false30
console.log(isDigit('.')); // false31
console.log(isDigit('+')); // false32
console.log(isDigit('*')); // false