It represents ~~ bi-bitwise operators,
If you want to use a faster method than Math.floor (), that is it.
It is noted that for a positive number, it is rounded down; for negative rounding up; non-numeric value is 0, it is a specific form of:
~~null; // => 0 ~~undefined; // => 0 ~~Infinity; // => 0 --NaN; // => 0 ~~0; // => 0 ~~{}; // => 0 ~~[]; // => 0 ~~(1/0); // => 0 ~~false; // => 0 ~~true; // => 1 ~~1.9; // => 1 ~~-1.9; // => -1
| Usage, usually used to rounding
1.2|0 // 1 1.8|0 // 1 -1.2|0 // -1
console.log(1553 / 10 | 0) // Result: 155 console.log(1553 / 100 | 0) // Result: 15 console.log(1553 / 1000 | 0) // Result: 1