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How to repeat string in JavaScript
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repeat
The JavaScript repeat method allows us to repeat a string an n number of times.
The repeat method takes count (number of times the string is to be repeated) as an argument. The value can be a positive number between 0 and +Infinity.
The repeat method will return a new string that contains count (number of times the source string is to be repeated).
let loading = "loading "; let dot = "." ; let tenDot = dot.repeat(10); console.log(loading + tenDot); // "loading .........."
In the above code, we have created ten . using the repeat method.
- When we pass
0as an argument we will get an empty string:
'.'.repeat(0) // ''
- When we pass a
floating point numberas an argument, the floating-point value is internally converted tointeger:
'.'.repeat(2.5) // '..' (2.5 will be converted to 2)
- When the negative number is passed as an argument, we will get
RangeError:
'.'.repeat(-1) //RangeError: Invalid count value
- When we pass
Infifnityas an argument, we will getRangeError:
'.'.repeat(Infinity); //RangeError: Invalid count value
Code
console.log("Passing 0 to repeat method")
console.log( " Passing 0 will return empty string", '.'.repeat(0) );
console.log("\n---------\n")
console.log("Passing 2.5 to repeat method")
console.log( "Passing 2.5 will convert 2.5 to 2",'.'.repeat(2.5) );
console.log("\n---------\n")
// the be;ow code willl throw error
try {
console.log("Passing -1 to repeat method")
'.'.repeat(-1);
} catch(e){
console.log("We can't pass negative numbers to repeat method.", e.message);
}
console.log("\n---------\n")
try {
console.log("Passing Infinity to repeat method")
'.'.repeat(Infinity);
} catch(e){
console.log("We can't pass Infinity to repeat method", e.message);
}RELATED TAGS
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