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Unique Symbols in TypeScript

TypeScript, like JavaScript, uses a variety of unique symbols to represent different concepts and operations. These symbols are used to define the syntax and structure of the language, and are essential for writing effective and efficient code.

Arithmetic Operators

TypeScript supports a range of arithmetic operators, including:

  • + (addition)
  • - (subtraction)
  • * (multiplication)
  • / (division)
  • % (modulus)
  • ** (exponentiation)

// Example usage:
let x = 5;
let y = 3;
console.log(x + y); // Output: 8
console.log(x - y); // Output: 2
console.log(x * y); // Output: 15
console.log(x / y); // Output: 1.6666666666666667
console.log(x % y); // Output: 2
console.log(x ** y); // Output: 125

Comparison Operators

TypeScript also supports a range of comparison operators, including:

  • == (equality)
  • != (inequality)
  • === (strict equality)
  • !== (strict inequality)
  • > (greater than)
  • < (less than)
  • >= (greater than or equal to)
  • <= (less than or equal to)

// Example usage:
let x = 5;
let y = 3;
console.log(x == y); // Output: false
console.log(x != y); // Output: true
console.log(x === y); // Output: false
console.log(x !== y); // Output: true
console.log(x > y); // Output: true
console.log(x < y); // Output: false
console.log(x >= y); // Output: true
console.log(x <= y); // Output: false

Logical Operators

TypeScript supports a range of logical operators, including:

  • && (logical and)
  • || (logical or)
  • ! (logical not)

// Example usage:
let x = true;
let y = false;
console.log(x && y); // Output: false
console.log(x || y); // Output: true
console.log(!x); // Output: false
console.log(!y); // Output: true

Assignment Operators

TypeScript supports a range of assignment operators, including:

  • = (assignment)
  • += (addition assignment)
  • -= (subtraction assignment)
  • *= (multiplication assignment)
  • /= (division assignment)
  • %= (modulus assignment)
  • **= (exponentiation assignment)

// Example usage:
let x = 5;
x += 3;
console.log(x); // Output: 8
x -= 2;
console.log(x); // Output: 6
x *= 2;
console.log(x); // Output: 12
x /= 2;
console.log(x); // Output: 6
x %= 3;
console.log(x); // Output: 0
x **= 2;
console.log(x); // Output: 0

Bitwise Operators

TypeScript supports a range of bitwise operators, including:

  • & (bitwise and)
  • | (bitwise or)
  • ^ (bitwise xor)
  • ~ (bitwise not)
  • << (left shift)
  • >> (right shift)
  • >>> (unsigned right shift)

// Example usage:
let x = 5;
let y = 3;
console.log(x & y); // Output: 1
console.log(x | y); // Output: 7
console.log(x ^ y); // Output: 6
console.log(~x); // Output: -6
console.log(x << 1); // Output: 10
console.log(x >> 1); // Output: 2
console.log(x >>> 1); // Output: 2

Other Operators

TypeScript also supports a range of other operators, including:

  • typeof (type of)
  • instanceof (instance of)
  • delete (delete)
  • in (in)
  • new (new)
  • void (void)

// Example usage:
let x = 5;
console.log(typeof x); // Output: "number"
console.log(x instanceof Number); // Output: false
delete x;
console.log(x); // Output: undefined
let obj = { foo: "bar" };
console.log("foo" in obj); // Output: true
let date = new Date();
console.log(date); // Output: current date
console.log(void 0); // Output: undefined

FAQs

What is the difference between the == and === operators?
The == operator checks for equality, while the === operator checks for strict equality. The === operator checks not only the value, but also the type of the operands.
What is the purpose of the void operator?
The void operator is used to specify that a function does not return a value. It is also used to evaluate an expression and return undefined.
What is the difference between the && and || operators?
The && operator is a logical and operator, while the || operator is a logical or operator. The && operator returns true if both operands are true, while the || operator returns true if either operand is true.
What is the purpose of the delete operator?
The delete operator is used to delete a property from an object. It returns true if the property is deleted successfully, and false otherwise.
What is the difference between the in and instanceof operators?
The in operator checks if a property exists in an object, while the instanceof operator checks if an object is an instance of a particular constructor.
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