Number API: Number.parseInt()

Number.parseInt() parses a string and returns an integer.

it is a static function on Number

const whatType = 'global'; assert.equal(whatType, typeof Number.parseInt);

is the same as the global function parseInt

const global = () => globalThis || window || global; const parseIntFunction = Number.parse_int; assert.equal(parseIntFunction, global().parseInt);

parseInt was specified in ECMAScript v1 (please find that ES1 kata for learning more)

const version = 6; assert.equal('ECMAScript v' + version, 'ECMAScript v1');

Links

spec docs Description of `Number.parseInt()` in the specification.
mdn docs The MDN docs for this function.
spec docs Spec chapter of the global `parseInt()` function.
discussion A twitter thread, where I explained the decision process of the creation of this kata and how it relates to the ES1 kata of this function.

Required Knowledge

• `parseInt()` (Global Object API)
• basics (Arrow functions)
• `const` declaration (Block scope)

Related Katas

Number API

• Number.isInteger()
• Number.isNaN()
• Number.parseInt()

Difficulty Level

BEGINNER

First Published

6 October 2019

Stats

3 tests to solve