44
44
44 + 34
78
44 + 34.0
78
44.5 + 44.0
88.5
44.5 + 44
88.5
44 + "dog"
"44dog"
function f(x){return 3*x+4;}
undefined
f(4)
16
f(30)
94
f("cat")
NaN
function f(x){return x+4;}
undefined
f(5)
9
f("cat")
"cat4"
f([1,2,3])
"1,2,34"