Tish - Native Performance, Familiar Syntax

Number literals

Numbers are IEEE-754 doubles. Literals may be written in plain or scientific (exponent) notation — e or E, an optional +/- sign, then digits:

1.5e-3     // 0.0015
1e10       // 10000000000
2E+3       // 2000
6.022e23   // Avogadro's number
let r = 2.5e2   // 250

The exponent is part of the literal, so 3e0, 1.25E2, and 5e-1 are all valid numbers.

Integers may also use hex, octal, or binary prefixes (any case), with optional _ digit separators:

0xff       // 255
0xDEADBEEF // 3735928559
0o17       // 15  (octal)
0b1010     // 10  (binary)
0xFF_FF    // 65535  (underscores group digits)
255 & 0xff // bit masks read naturally

String conversion

console.log(n), String(n), "" + n, and template literals all follow JavaScript's Number.prototype.toString exactly — including the switch to exponential notation once the decimal point lands past digit 21 or before digit −6 (the shortest round-tripping form):

console.log(6.022e23)   // "6.022e+23"  (not 602200000000000000000000)
console.log(1e-7)       // "1e-7"
console.log(1e21)       // "1e+21"
console.log(1e-6)       // "0.000001"   (still in decimal range)
console.log(123.456)    // "123.456"
console.log(0.1 + 0.2)  // "0.30000000000000004"

Number.prototype.toFixed

Method	Description
`n.toFixed(digits?)`	Format number with fixed decimal places (0–20). Returns a string. Default `digits` is 0.

Examples

let n = 3.14159
console.log(n.toFixed(2))   // "3.14"
console.log(n.toFixed(0))   // "3"
console.log((42).toFixed(2)) // "42.00"
console.log((0).toFixed(2))  // "0.00"
console.log((-1.234).toFixed(2)) // "-1.23"

Useful for currency formatting: "$" + total.toFixed(2).