Javascript most useful build-in function.

Javascript is a scripting or dynamic computer programming language. it can change an updated HTML and CSS. Nowadays javascript can be used client-side and server-side also. Today I will clear javascript 10 basic concepts.

1. String: Javascript string is a simple text. a string text we can write inside single or double-quotes.

Example: var name = “Iftekhar Hossain”

console.log(name);

//result = “iftekhar Hossain”

2. Number: Javascript number is a numeric value. a number we can write simple system.

Example: var age = 22;

console.log(age);

//result = 22

3. Object: Javascript object is one kind of variable. There we can store multiple values.

Example: const student = { name : ‘Emon’, age : 22, height : 5.6}

console.log(student);

//result = { name : ‘Emon’, age : 22, height : 5.6}

4. Array: Array is a collection of objects. When we need to store huge value then we can use it.

Example: var names = [‘rohim’, ‘korim’, ‘kholil’, ‘kalam’, ‘jamal’];

console.log(names.length);

//result = 5

5. Slice: javascript slice is a method thought which we can cut any array function.

Example: var names = [‘rohim’, ‘korim’, ‘kamal’, ‘jamal’, ‘rajjak’];

var result = names.slice(1, 4);

//result = [‘korim’, ‘kamal’, ‘jamal’];

6. Trim: javascript trim method used for remove start and end blank space in a string.

Example: var name = “ jhankar mahbub “;

console.log(name);

//result = “jhankar mahbub”

7. Random: Javascript random number returns a floating point number. these value range 0 less then 1(but not 0 or 1)

Example: function getRandomInt(max) {

return Math.floor(Math.random() * max);

}

// result = result always provide a random number.

8. find: Find is a useful method in array. find function go to all number an array, when function return true, then function provide result

Example: const array1 = [5, 12, 8, 130, 44];

const found = array1.find(element => element > 10);

console.log(found);

//result = 12

9. map: javascript map() method creates a new array.

Example: const array = [1, 4, 9, 16];

const map = array.map(x => x * 2);

console.log(map);

//result = [2, 8, 18, 32]

10. push: javascript push() method change main array. when we can add anything it add last in the array.

Example: const number = [1, 2, 3, 4, 5];

number.push(6);

console.log(number);

//result = [1, 2, 3, 4, 5, 6];