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In this function, when it is compared the lenght of the array it is used != operator and when it is comparing all elements of the array it is using !== operator. Why?! Thx.
var a = [1,2,3];
var b = [2,3,4];
function equalArrays(a,b){
if(a.length != b.length) return false;
for(var i = 0; i < a.length; i++)
if(a[i] ==! b[i]) return false;
return true;
}
767
means that two variables are being checked for both their value and their value type ( 8!== 8 would return false while 8!== "8" returns true). != only checks the variable's value ( 8!=
The equal-to operator ( == ) returns true if both operands have the same value; otherwise, it returns false . The not-equal-to operator ( != ) returns true if the operands don't have the same value; otherwise, it returns false .
The strict equality operator ( === ) behaves identically to the abstract equality operator ( == ) except no type conversion is done, and the types must be the same to be considered equal. The == operator will compare for equality after doing any necessary type conversions.
The != operator compares the value or equality of two objects, whereas the Python is not operator checks whether two variables point to the same object in memory.
= is an assignment operator, e.g. If you run var x = 1; then x will have the value of 1.
== (or !=) is a comparison operator that checks if the value of something is equal to the value of something else. e.g. if(x == 1) will evaluate to true and so will if(x == true) because 1 will evaluate to true and 0 evaluate to false.
=== (or !==) is another comparison operator that checks if the value of something is equal to the value of, and is the same type as something else. e.g. if(x === 1) will evaluate to true however, if(x === true) will evaluate to false because 1 (the value of x) is an integer and true is a boolean.
149
The following are true:
false == false
false == null
false == undefined
false == 0
2 == "2"
The following are NOT true:
false === null
false === undefined
false === 0
2 === "2"
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