Order of Operations in JavaScript
Operators are evaluated in the order supplied in the following table. Associativity applies when more than one operation with the same precedence takes place. Left-to-right Associativity means that operations of equal weight in a single statement are performed from left to right.
| Order | Assoc | Operator | Summary |
|---|---|---|---|
| 1 |
L L L R |
. [] () new |
Retrieve object property. Array index or associative object property. Function call. Instantiate an object. |
| 2 |
R R R R R R R R R |
++ -- - + ~ ! delete typeof void |
Pre- or post-increment. (unary) Pre- or post-decrement. (unary) Negation. (unary, NOT subtraction) No operation, use numerical value. (unary, NOT addition) Bitwise complement. (unary) Logical complement. (unary) Destroy an object property. (unary) Return datatype. (unary) Return undefined. (unary) |
| 3 | *, /, % | L | Multiply, divide, modulo (remainder) |
| 4 |
L L |
+, - + |
Add, subtract. Concatenate strings. |
| 5 |
L L L |
<< >> >>> |
Shift left. Shift right and extend sign. Shift right and pad with zeroes. |
| 6 |
L L L L |
<, <= >, >= instanceof in |
Less than, less than or equal. Greater than, greater than or equal. Verify an object's constructor. Verify an object's property exists. |
| 7 |
L L L L |
== != === !== |
Are operands equal? Are operands NOT equal? Are operands identical? Are operands NOT identical? |
| 8 | L | & | Bitwise AND |
| 9 | L | ^ | Bitwise XOR |
| 10 | L | | | Bitwise OR |
| 11 | L | && | Local AND |
| 12 | L | || | Local OR |
| 13 | R | ? : | Conditional operator (ternary) |
| 14 |
R R |
= *=, /=, %=, +=, -=, <<=, >>=, >>>=, &=, ^=, |= |
Assign value. Perform operation, then assign value. |
| 15 | L | , (comma) | Multiple evaluation. |
- share this post:
0 Comments