Let suppose I have an array like this
Let data = [ [bob,male,90,pass][sam,male,70,pass][grace,female,75,pass][harry,male,20,fail] ]
and I want to extract all the names and store them in a seperate array then how can I do it ? Means output should be like
[bob,sam,grace,harry]
1) You can use map here with destructuring
let data = [
["bob", "male", 90, "pass"],
["sam", "male", 70, "pass"],
["grace", "female", 75, "pass"],
["harry", "male", 20, "fail"],
];
const result = data.map(([name]) => name);
console.log(result);2) Using map with index
let data = [
["bob", "male", 90, "pass"],
["sam", "male", 70, "pass"],
["grace", "female", 75, "pass"],
["harry", "male", 20, "fail"],
];
const result = data.map((arr) => arr[0]);
console.log(result);Using for loops and switch:
// data array
let data = [
['bob','male',90,true],
['sam','male',70,true],
['grace','female',75,true],
['harry','male',20,false]
];
// instantiate sorted arrays
let names = [];
let gender = [];
let age = [];
let pass = [];
// iterate on the array containing arrays
for (let x = 0; x < data.length; x++) {
// iterate inside the arrays
for (let y = 0; y < data[x].length; y++) {
// curData store the data we just now are looking at
// while iterating through all the data
curData = data[x][y];
// depending on y, save the data to the correct array
switch (y) {
case 0:
names.push(curData);
break;
case 1:
gender.push(curData);
break;
case 2:
age.push(curData);
break;
case 3:
pass.push(curData);
break;
}
}
}
// print them out
console.log(names);
console.log(gender);
console.log(age);
console.log(pass);