Hi to day i'll digg into shift(), unshift(), pop(), push(), concat(), splice() functions of javascript :
var arr, alphaNumeric;
var alpha = ['A', 'B', 'C'];
var numeric = [10, 20,
30];
arr = alpha;
console.log('ORIGINAL ARRAY: '+
arr);
// SHIFT
var shifted =
arr.shift();
console.log('SHIFTED: '+
shifted);
console.log('ARRAY AFTER SHIFT:
'+ arr);
// UNSHIFT
var toUnshift = ['D'];
arr.unshift(toUnshift);
console.log('UNSHIFTED: '+
toUnshift);
console.log('ARRAY AFTER
UNSHIFT: '+ arr);
// POP
var popped = arr.pop();
console.log('POPPED: '+
popped);
console.log('ARRAY AFTER POP: '+
arr);
// PUSH
var toPush = ['Z'];
arr.push(toPush);
console.log('PUSHED: '+
toPush);
console.log('ARRAY AFTER PUSH: '+
arr);
// CONCATE
alphaNumeric = alpha.concat(numeric);
console.log('ARRAY: '+
arr);
console.log('ALPHA: '+
alpha);
console.log('NUMERIC: '+
numeric);
console.log('ALPHANUMERIC: '+
alphaNumeric);
alphaNumeric = alpha.concat(1, [2, 3]);
console.log('NEW ALPHANUMERIC: '+
alphaNumeric);
// SPLICE
var startingIndex = 2,
howManyToRemove = 2;
var elementsToAdd = ['P'];
var removed;
var minVal =
Number.MIN_VALUE, maxVal = Number.MAX_VALUE;
//removed = alphaNumeric.splice(); // does nothing
//removed = alphaNumeric.splice(startingIndex); // removes all from
the given index
//removed = alphaNumeric.splice(startingIndex, howManyToRemove); //
removes 'n' from the given index
removed = alphaNumeric.splice(startingIndex,
howManyToRemove, elementsToAdd); // removes 'n' from
the given index, and then add new elements
//removed = alphaNumeric.splice(startingIndex, minVal);
//removed = alphaNumeric.splice(startingIndex, maxVal);
//console.log('minVal: '+ minVal);
//console.log('maxVal: '+ maxVal);
console.log('SPLICED: '+
removed);
console.log('ARRAY AFTER SPLICE:
'+ alphaNumeric);
