python check if char is a number code example

Example 1: javascript is variable a string

if (typeof myVar === 'string'){
    //I am indeed a string
}

Example 2: js check if string is number

isNaN(num)         // returns true if the variable does NOT contain a valid number

isNaN(123)         // false
isNaN('123')       // false
isNaN('1e10000')   // false (This translates to Infinity, which is a number)
isNaN('foo')       // true
isNaN('10px')      // true

Example 3: isdigit

Non-zero integer ( x > 0 )	Argument is a numeric character.
Zero (0)	Argument is not a numeric character.

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Javascript Example

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