js string search
var str = "This is a test sentence";
var hasTest = str.includes("test");
if(hasTest == true){
//do a thing
}js string search
var str = "This is a test sentence";
var hasTest = str.includes("test");
if(hasTest == true){
//do a thing
}search in javascript
var str = "Please locate where 'locate' occurs!";
var ind1 = str.indexOf("locate"); // return location of first value which founded
var ind2 = str.lastIndexOf("locate"); // return location of last value which founded
var ind3 = str.indexOf("locate", 15); // start search from location 15 and then take first value which founded
var ind4 = str.search("locate");
//The search() method cannot take a second start position argument.
//The indexOf() method cannot take powerful search values (regular expressions).
document.write("<br>" + "Length of string:", len);
document.write("<br>" + "indexOf:", ind1);
document.write("<br>" + "index of last:", ind2);
document.write("<br>" + "indexOf with start point:", ind3);
document.write("<br>" + "search:", ind4);function search in javascript array
// function to search array using for loop
function findInArray(ar, val) {
for (var i = 0,len = ar.length; i < len; i++) {
if ( ar[i] === val ) { // strict equality test
return i;
}
}
return -1;
}
// example array
var ar = ['Rudi', 'Morie', 'Halo', 'Miki', 'Mittens', 'Pumpkin'];
// test the function
alert( findInArray(ar, 'Rudi') ); // 0 (found at first element)
alert( findInArray(ar, 'Coco') ); // -1 (not found)search in javascript
str.indexOf("locate"); // return location of first find value
str.lastIndexOf("locate"); // return location of last find value
str.indexOf("locate", 15); // start search from location 15 and then take first find value
str.search("locate");
//The search() method cannot take a second start position argument.
//The indexOf() method cannot take powerful search values (regular expressions).array search
/*
Arrays Methods [Search]
- indexOf(Search Element, From Index [Opt])
- lastIndexOf(Search Element, From Index [Opt])
- includes(valueToFind, fromIndex [Opt]) [ES7]
*/
let myFriends = ["Ahmed", "Mohamed", "Sayed", "Alaa", "Ahmed"];
console.log(myFriends);
console.log(myFriends.indexOf("Ahmed"));
console.log(myFriends.indexOf("Ahmed", 2));
console.log(myFriends.lastIndexOf("Ahmed"));
console.log(myFriends.lastIndexOf("Ahmed", -2));
console.log(myFriends.includes("Ahmed"));
console.log(myFriends.includes("Ahmed", 2));
if (myFriends.lastIndexOf("Osama") === -1) {
console.log("Not Found");
}
console.log(myFriends.indexOf("Osama"));
console.log(myFriends.lastIndexOf("Osama"));Copyright © 2021 Codeinu
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