On recent web browsers,
“1_000_000 === 1000000”
That is because it is a “Numeric Separator” specification that allows underscores in numeric value. (https://github.com/tc39/proposal-numeric-separator)
If you try to write value like 1 billion, you can improve the readability of numbers by separating them with underscores.
let a = 1000000000000; let b = 1_000_000_000_000; console.log(a===b); // TRUE
“Numeric Separator” supports not only integers but also various numerical formats.
// Decimal let dec = 1_000_000.220_720; // Binary let bin = 0b1010_0001_1000_0101; // Octal let oct = 0o1234_5670; // Hexadecimal let hex = 0xA0_B0_C0; // BigInt let bint = 9_223_372_036_854_775_807n;