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JavaScript: Assignment Operators

Assignment Operators

An assignment operator assigns a value to its left operand based on the value of its right operand. The first operand must be a variable and basic assignment operator is equal (=), which assigns the value of its right operand to its left operand. That is, a = b assigns the value of b to a.

 In addition to the regular assignment operator "=" the other assignment operators are shorthand for standard operations, as shown in the following table.

Shorthand Expression Description
a +=b a = a + b Adds 2 numbers and assigns the result to the first.
a -= b a = a - b Subtracts 2 numbers and assigns the result to the first.
a *= b a = a*b Multiplies 2 numbers and assigns the result to the first.
a /=b a = a/b Divides 2 numbers and assigns the result to the first.
a %= b a = a%b Computes the modulus of 2 numbers and assigns the result to the first.
a<<=b a = a<<b Performs a left shift and assigns the result to the first operand.
a>>=b a = a>>b Performs a sign-propagating right shift and assigns the result to the first operand.
a>>>=b a = a>>>b Performs a zero-fill right shift and assigns the result to the first operand.
a&= b a = a&b Performs a bitwise AND and assigns the result to the first operand.
a^= b a = a^b Performs a bitwise XOR and assigns the result to the first operand.
a |=b a = a|b Performs a bitwise OR and assigns the result to the first operand.

Previous: JavaScript: Arithmetic Special Operators (%, ++, --, - )
Next: JavaScript: Bitwise Operators

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04