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
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