js check if string or int
// 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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4.5
4
if (typeof myVar === 'string'){<br/> //I am indeed a string<br/>}
Thank you!
4
0
4
2
function isInt(str) {
return !isNaN(str) && Number.isInteger(parseFloat(str));
}
Thank you!
2
0
4.5
4
function isNumber(n) { return /^-?[\d.]+(?:e-?\d+)?$/.test(n); }
------------------------
isNumber('123'); // true
isNumber('123abc'); // false
isNumber(5); // true
isNumber('q345'); // false
isNumber(null); // false
isNumber(undefined); // false
isNumber(false); // false
isNumber(' '); // false
Thank you!
4
0
4.5
6
var myString = "abc123";
var otherString = "123";
/* isInterger() checks if an value repersents an int */
Number.isInteger(myString); //returns false
Number.isInteger(otherString); //returns true
Thank you!
6
0
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