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I am passing in a parameter called value. I'd like to know if value is a float. So far, I have the following:
if (!isNaN(value)) { alert('this is a numeric value but not sure if it is a float.'); } How do I go one step further and convert the string to something that can evaluate to a float?
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To check if a string is an integer or a float:Use the str. isdigit() method to check if every character in the string is a digit. If the method returns True , the string is an integer. If the method returns False , the string is a floating-point number.
We pass the value of the 'string' variable as the parameters of the float() method. Create a variable for storing the result. If the defined string is a float number, it returns 'True,' and if the defined string is not a float value, it returns 'False.
A STRING is literally a "string" of characters. A letter, a sentence, anything that is not a "value" .. A FLOAT is just a number with a decimal. As an INT is a whole number (no decimal) - a FLOAT is basically like an INT but with a decimal.
Like this:
if (!isNaN(value) && value.toString().indexOf('.') != -1) { alert('this is a numeric value and I\'m sure it is a float.'); } You can use the parseFloat function.
If the value passed begins with what looks like a float, the function returns the value converted to a float, otherwise it will return NaN.
Something like:
function beginsWithFloat(val) { val = parseFloat(val); return ! isNaN(val); } console.log(beginsWithFloat("blabla")); // shows false console.log(beginsWithFloat("123blabla")); // shows trueIf you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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