Introduction to JavaScript String Methods

            

        

          

          
          

          

              

                  
              

          







localeCompare Method


let x ='a'
let y ='b'
console.log(x.localeCompare(y));
  //here a is not coming after b so -1 
  //checks whether the compare string comes after or before the given string 
  //all uppercase letters come before lower case letters in js 

  
Output

  -1









charAt Method


let x = 'satish'
console.log(x.charAt(0));

  
Output

  s







concat method


let x = 'Satish'
console.log(x.concat('C J')); 

  
Output

  SatishC J









includes method


let x = 'Satish teaches javaScript'
console.log(x.includes("teach"));

  
Output

   true









endswith method


let x = 'Satish teaches javaScript'
console.log(x.endsWith('ish',6));//checks if the first 6 characters ends with ish


Output

   true









startswith method

  
 let x = 'Satish teaches javaScript'
console.log(x.startsWith('teach',7));
//checks if the string starts with teach in index 7 

    
Output

    true
  

  

  

  

    
indexOf method

    
 let x = 'Satish teaches javaScript'
console.log(x.indexOf("teaches")); //returns the index where match occurs
//-1 is returned for no match

      
Output

       7
    

    

    

    

      
lastindexof method

      
let x = 'Satish teaches javaScript'
  console.log(x.lastIndexOf("Satish"));

        
Output

        0
      

      

      

      

        
length method

        
let x = 'Satish'
console.log(x.length);

          
Output

          6
        

        

        

        

          
repeat method


let x = 'Satish'
console.log(x.repeat(3));

  
Output

  SatishSatishSatish


          

          




replace method


let x = 'Mr. Satish'
console.log(x.replace('Mr','Dr'));


Output

Dr. Satish







slice method


let x = 'Satish'
  console.log(x.slice(0,3));


Output

 Sat







replace method in Arrays


let x = 'Mr. Satish'
console.log(x.replace('Mr','Dr'));


Output

Dr. Satish 







split method


let x = 'Satish is teaching javascript'
const k = x.split(" ");
for(let i of k)
{
  console.log(i);
}


Output

Satish
is
teaching
javascript







substring method


let x ="Satish"
console.log(x.substring(0,2));


Output

Sa 







toLowerCase method


let x ="Satish"
console.log(x.toLowerCase());


Output

satish







touppercase method


let x ="Satish"
console.log(x.toUpperCase());


Output

SATISH







trim method


let x =" Satish "
console.log(x.trim());
//variations are trimStart() and trimEnd()


Output

Satish