Class 1: An array is an object. Many values contain an array. So, the array is important in javascript.
Arrays Syntex- const=['value', 'value', 'value']
Also can be written- Const a=[7, "string", boollean]
Some example array codes-
let marks_class_12 = [91, 82, 63, 84, false, "Not Present"]
print this- console.log(marks_class_12)
individual track the number then code is:
console.log(marks_class_12[0])
console.log(marks_class_12[1])
console.log(marks_class_12[2])
console.log(marks_class_12[3])
console.log(marks_class_12[4])
console.log(marks_class_12[5])// index written rules. means position.
Here- 0, 1, 2, 3 array index that means position
0-91
1-82
2-63
console.log(marks_class_12[6]) // Will be undefined because index 6 does not exist
Anyone can define [6] then the code is
marks_class_12[6] = 89 // Adding a new value to the array
then do console.log
## If you want to change on arrays any position-
marks_class_12[0] = 96 // Changing the value of an array
then type code- console.log(marks_class_12)
Here Full Code -
let marks_class_12 = [91, 82, 63, 84, false, "Not Present"]
console.log(marks_class_12[0])
console.log(marks_class_12[1])
console.log(marks_class_12[2])
console.log(marks_class_12[3])
console.log(marks_class_12[4])
console.log(marks_class_12[5])
console.log(marks_class_12[6]) // Will be undefined because index 6 does not exist
console.log("The length of marks_class_12 is", marks_class_12.length)
marks_class_12[6] = 89 // Adding a new value to the array
marks_class_12[0] = 96 // Changing the value of an array
console.log(marks_class_12)
Now 2 topics are very important - 1. typeof
2. .length
typeof means - how are arrays??- object or string or boolean
let marks_class_12 = [91, 82, 63, 84, false, "Not Present"]
console.log(typeof marks_class_12)
.lenth means - how arrays length? -
let marks_class_12 = [91, 82, 63, 84, false, "Not Present"]
console.log("The length of marks_class_12 is", marks_class_12.length)
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