check if string only contains integer digits numbers javascript
let val = '1234567890'
let isnum = /^\d+$/.test(val);
if (isnum) {
// val is a number
}check if string only contains integer digits numbers javascript
let val = '1234567890'
let isnum = /^\d+$/.test(val);
if (isnum) {
// val is a number
}check if number is single digit javascript
function hasOneDigit(val) {
return String(Math.abs(val)).charAt(0) == val;
}
console.log(hasOneDigit(1)); // true
console.log(hasOneDigit(12)); // falseCopyright © 2021 Codeinu
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