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str = "hello123!"
if(/\d/.test(str))
console.log(str+" has a number.")
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// native returns true if the variable does NOT contain a valid number
isNaN(num)
// can be wrapped for making simple and readable
function isNumeric(num){
return !isNaN(num)
}
isNumeric(123) // true
isNumeric('123') // true
isNumeric('1e10000') // true (This translates to Infinity, which is a number)
isNumeric('foo') // false
isNumeric('10px') // false
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const str = "vikash123!";
const hasNumber = /\d/.test(str);
console.log(hasNumber) // true
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function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.
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isNaN(num) // returns true if the variable does NOT contain a valid number
isNaN(123) // false
isNaN('123') // false
isNaN('1e10000') // false (This translates to Infinity, which is a number)
isNaN('foo') // true
isNaN('10px') // true
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function containsNumber(str) {
return str.match(/\d+/) !== null;
}
// Example usage
console.log(containsNumber("Hello World")); // Output: false
console.log(containsNumber("Hello123")); // Output: true
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// add prefix to classname if a string contains numbers
<div key={uuidv4()} className={header.props && header.props.children?`header ${/\d/.test(header.props.children) ? `time_${header.props.children}`: header.props.children}`: 'header'}>{header}</div>