Type conversion: to number

Type conversion - to number

undefined converts to NaN

const toNumber = Number(0); assert(isNaN(toNumber));

null converts to +0

const toNumber = null; assert.equal(toNumber, +0);

the string "0xFF" is interpreted as a hex number

const hex = Number('0xFF'); assert.equal(hex, 0xFF);

a decimal number can also be converted

const decimal = Number('1.234'); assert.equal(decimal, 1.234);

can also be converted with a simple + unary operator

const one = + '1'; assert.strictEqual(one, 1);

Required Knowledge

• All unary operators (Unary Operators)

Related Katas

Type conversion

• to boolean

Difficulty Level

INTERMEDIATE

Stats

5 tests to solve