How to find that a number is float
or integer
?
1.25 --> float
1 --> integer
0 --> integer
0.25 --> float
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Trying some of the answers here I ended up writing this solution. This works also with numbers inside a string.
function isInt(number) {
if(!/^["|']{0,1}[-]{0,1}\d{0,}(\.{0,1}\d+)["|']{0,1}$/.test(number)) return false;
return !(number - parseInt(number));
}
function isFloat(number) {
if(!/^["|']{0,1}[-]{0,1}\d{0,}(\.{0,1}\d+)["|']{0,1}$/.test(number)) return false;
return number - parseInt(number) ? true : false;
}
var tests = {
'integer' : 1,
'float' : 1.1,
'integerInString' : '5',
'floatInString' : '5.5',
'negativeInt' : -345,
'negativeFloat' : -34.98,
'negativeIntString' : '-45',
'negativeFloatString' : '-23.09',
'notValidFalse' : false,
'notValidTrue' : true,
'notValidString' : '45lorem',
'notValidStringFloat' : '4.5lorem',
'notValidNan' : NaN,
'notValidObj' : {},
'notValidArr' : [1,2],
};
function isInt(number) {
if(!/^["|']{0,1}[-]{0,1}\d{0,}(\.{0,1}\d+)["|']{0,1}$/.test(number)) return false;
return !(number - parseInt(number));
}
function isFloat(number) {
if(!/^["|']{0,1}[-]{0,1}\d{0,}(\.{0,1}\d+)["|']{0,1}$/.test(number)) return false;
return number - parseInt(number) ? true : false;
}
function testFunctions(obj) {
var keys = Object.keys(obj);
var values = Object.values(obj);
values.forEach(function(element, index){
console.log(`Is ${keys[index]} (${element}) var an integer? ${isInt(element)}`);
console.log(`Is ${keys[index]} (${element}) var a float? ${isFloat(element)}`);
});
}
testFunctions(tests);