JavaScript: parseInt() function
Description
The parseInt is used to get a numeric value from a string. parseInt is a top-level function and is not associated with any object.
Syntax
parseInt(numString, radix)
Parameters
numString: Required. A string that represents the value to test.
radix: Optional. An integer that represents the radix of the return value. A value between 2 and 36 indicating the base of the number contained in numString. For example, a radix of ten indicates to convert to a decimal number, eight octal, sixteen hexadecimal, and so on.
Example of parseInt() function
The following example shows how to use the parseInt() function.
JavaScript Code:
console.log('"21" -> '+parseInt("21"));
console.log('"21.42" -> '+parseInt("21.42"));
console.log('"100 234 54" -> '+parseInt("100 234 54"));
console.log('"89 Math" ->'+parseInt("89 Math"));
console.log('"Math 89" ->'+parseInt("Math 89"));
console.log();
console.log(parseInt("100",10));
console.log(parseInt("001"));
console.log(parseInt("100",8));
console.log(parseInt("0x10"));
console.log(parseInt("10",16));
View the example in the browser
Live demo:
See the Pen parselnt-function-1 by w3resource (@w3resource) on CodePen.
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JavaScript: parseFloat() function
JavaScript: Tips of the Day
Returns all unique values of an array, based on a provided comparator function
Example:
const tips_uniqueElementsBy = (arr, fn) => arr.reduce((acc, v) => { if (!acc.some(x => fn(v, x))) acc.push(v); return acc; }, []); console.log(tips_uniqueElementsBy( [ { id: 0, value: 'p' }, { id: 1, value: 'q' }, { id: 2, value: 'r' }, { id: 1, value: 's' }, { id: 0, value: 't' } ], (a, b) => a.id == b.id ));
Output:
[[object Object] { id: 0, value: "p" }, [object Object] { id: 1, value: "q" }, [object Object] { id: 2, value: "r" }]
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