Had a heated discussion with a friend about a particular expression and so this blog with ready references for some basic JavaScript expressions.
Having fun yet ?
| Expression | Value |
|---|---|
| Infinity | Anything beyond +/-1.7976931348623157e+308 |
| typeof Infinity | "number" |
| typeof NaN | "number" |
| typeof undefined | "undefined" |
| typeof null | "object" |
| Infinity + Infinity | Infinity |
| Infinity - Infinity | NaN |
| -Infinity + Infinity | NaN |
| Infinity / Infinity | NaN |
| Infinity * Infinity | Infinity |
| Infinity * 1 | Infinity |
| Infinity / 1 | Infinity |
| Infinity / 0 | Infinity |
| Infinity * 0 | NaN |
| Infinity - 1e308 | Infinity |
| Infinity - 1e309 | NaN |
| -Infinity + 1e308 | -Infinity |
| -Infinity + 1e309 | NaN |
| Infinity / 1e308 | Infinity |
| 1 * "a" | NaN |
| 1 + NaN | NaN |
| 1 * NaN | NaN |
| undefined + 1 | NaN |
| undefined * 1 | NaN |
| undefined + Infinity | NaN |
| undefined * Infinity | NaN |
| undefined + NaN | NaN |
| undefined * NaN | NaN |
| undefined + null | NaN |
| undefined * null | NaN |
| 1 + null | 1 |
| 1 * null | 0 |
| null + null | 0 |
| null * null | 0 |
| Infinity + null | Infinity |
| Infinity * null | NaN |
| NaN + null | NaN |
| NaN * null | NaN |
| "" + Infinity | "Infinity" |
| "" + NaN | "NaN" |
| "" + null | "null" |
| "" + undefined | "undefined" |
Having fun yet ?
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