RangeError: argument is not a valid code point.Error: Permission denied to access property "x".Implemented in JavaScript 1.3ĭefined in several sections of the specification: Relational Operators, Equality Operators Implemented in JavaScript 1.0Īdds = and != operators. is converted to String 'foo' before comparison true as a and 'foo' are of different type and, the Object (a) false as a and b are type Object and reference different objects Note: String objects are Type Object, not String! String objects are rarely used, so the following results might be surprising: // true as both operands are type String (i.e. If both operands are objects, they're compared as objects, and the equality test is true only if both refer the same object. Note that an object is converted into a primitive if, and only if, its comparand is a primitive.If this attempt to convert the object fails, a runtime error is generated. Operators attempt to convert the object to a primitive value, a String or Number value, using the valueOf and toString methods of the objects. If an object is compared with a number or string, JavaScript attempts to return the default value for the object.If one of the operands is Boolean, the Boolean operand is converted to 1 if it is true and +0 if it is false.Next, this value is rounded to nearest Number type value. First, a mathematical value is derived from the string numeric literal. JavaScript attempts to convert the string numeric literal to a Number type value. When comparing a number and a string, the string is converted to a number value.When type conversion is involved in the comparison (i.e., non–strict comparison), JavaScript converts the types String, Number, Boolean, or Object operands as follows: Otherwise, use the standard equality operators, which allow you to compare the identity of two operands even if they are not of the same type. Use strict equality operators if the operands must be of a specific type as well as value or if the exact type of the operands is important. If the operands are of different types, the result is always false so 5 != '5'. The strict equality operators ( = and !=) use the Strict Equality Comparison Algorithm and are intended for performing equality comparisons on operands of the same type. If the operands are of different types, it will attempt to convert them to the same type before making the comparison, e.g., in the expression 5 = '5', the string on the right is converted to Number before the comparison is made. The standard equality operators ( = and !=) use the Abstract Equality Comparison Algorithm to compare two operands. The less than or equal operator returns true if the left operand is less than or equal to the right operand. The less than operator returns true if the left operand is less than the right operand. The greater than or equal operator returns true if the left operand is greater than or equal to the right operand. The greater than operator returns true if the left operand is greater than the right operand. For relational abstract comparisons (e.g., ) =) converts the operands to the same type before making the comparison. The more commonly-used abstract comparison (e.g. A strict comparison (e.g., =) is only true if the operands are of the same type and the contents match. JavaScript has both strict and type–converting comparisons.
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