What is Strict Mode and Push() method in JavaScript?

Question

Give the example for strict mode "use strict"

Answer 1

Strict Mode:

• The fifth edition of ECMAScript specification has introduced Script Mode.-Strict Mode applies a layer of constraint on JavaScript.
• It throws errors for actions that are problematic and didn’t throw an error before.
• It throws errors for the actions which are potentially unsafe.
• It shut downs the functions which are poorly thought out.
• Strict mode solves mistakes that are responsible for the difficulty of JavaScript engines to perform optimizations.

• To enable the strict mode we have to add the string literal “use strict” on the top of file or function as follow:

  function myfunction()
  {
  “use strict";
  var v = “I am a strict mode function";
  }

Push Method: The push() method is used to append one or more elements to the end of an array.

For example:

var fruits = [ "apple" ];
fruits.push( "banana" );
fruits.push( "mango", "strawberry” );
console.log(fruits);

we get the following console output:

["apple ", "banana ", "mango ", "strawberry "]

Using Push() method we can also append multiple elements by passing multiple arguments.
The elements will be appended in the order of they are inserted i.e. left to right.