Check if a number has a decimal place/is a whole number
Using modulus will work:
num % 1 != 0// 23 % 1 = 0// 23.5 % 1 = 0.5Note that this is based on the numerical value of the number, regardless of format. It treats numerical strings containing whole numbers with a fixed decimal point the same as integers:
'10.0' % 1; // returns 010 % 1; // returns 0'10.5' % 1; // returns 0.510.5 % 1; // returns 0.5
Number.isInteger(23); // trueNumber.isInteger(1.5); // falseNumber.isInteger("x"); // false: Number.isInteger() is part of the ES6 standard and not supported in IE11.
It returns false for NaN, Infinity and non-numeric arguments while x % 1 != 0 returns true.
Or you could just use this to find out if it is NOT a decimal:
string.indexOf(".") == -1;