# Expression {#expression}

An expression is composed of objects and operators. Objects in expression could be constant, variable, function, expression, etc.

```
3>2;
// output: 1

x=true;
!x;
// output: 0

x=1 2 3
x*2;
// output: [2,4,6]

y = 4 5 6;
x+y;
// output: [5,7,9]

x+y*2;

(y-avg(y))*(y-avg(y));
// output: [1,0,1]

t1 = table(x,y);
t1.y[0]\sum(t1.y);
// output: 0.266667
```

**Parent topic:**[Objects](../../Programming/Objects/Objects.md)

