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=== (strict equality)

strict equality, comparison, ===

Availability

Flash Player 6.

Usage

    expression1 === expression2

Description

Operator; tests two expressions for equality; the strict equality operator performs just like the equality operator except that data types are not converted. The result is `true` if both expressions, including their data types, are equal.

The definition of equal depends on the data type of the parameter:

| Numbers and Boolean values are compared by value, and are considered equal if they have the same value.
| String expressions are equal if they have the same number of characters and the characters are identical.
| Variables, objects, arrays, and functions are compared by reference. Two variables are equal if they refer to the same object, array, or function. Two separate arrays are never considered equal, even if they have the same number of elements.

Example

The following code displays the returned value of operations that use the equality, strict equality, and strict inequality operators.

    s1 = new String("5");
    s2 = new String("5");
    s3 = new String("Hello");
    n  = new Number(5);
    b = new Boolean(true);

    s1 == s2; // true
    s1 == s3; // false
    s1 == n; // true
    s1 == b; // false

    s1 === s2;  // true
    s1 === s3; // false
    s1 === n; // false
    s1 === b; // false

    s1 !== s2; // false
    s1 !== s3; // true
    s1 !== n; // true
    s1 !== b; // true

See also

`== (equality)`, `!= (inequality)`, `=== (strict equality)`