为什么在使用 split function of javascript 时出现错误？

Question

I'm trying to split my string but not get proper output as per my expected.

Input

let name = "helloguys";

Output

h
he
hel
hell
hello
hellog
hellogu
helloguy
helloguys

let name = "mynameisprogrammer";
for (let index = 1; index <= name.length; index++) {
  let finalData = name.split(name[index]);
  console.log(finalData[0]);
}

enter image description here

Answer 1

You can use substring to take parts of your input:

 let name = "mynameisprogrammer"; for (let index = 1; index <= name.length; index++) { let finalData = name.substring(0, index); console.log(finalData); }

Answer 2

You could use Array.map() along with String.slice() to split the string into the required values:

 let name = "mynameisprogrammer"; let result = [...name].map((chr, idx) => name.slice(0, idx + 1)); console.log('Result:', result)

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Answer 3

If you need this to be unicode aware, you might want to avoid using string substring / slice etc.

Instead convert to array, and split there.

eg..

 let name = "mynameisprogrammer"; const nameA = [...name]; for (let ix = 1; ix <= nameA.length; ix += 1) console.log(nameA.slice(0, ix).join(''));

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ps. To see what I mean by unicode aware, try using the name from the code above into some of the other answers.

Answer 4

You can simply use a variable and keeping add value of current index and keep printing on each iteration, you don't need split here

 let name = "helloguys"; function printName(name) { let temp = '' for (let index = 0; index < name.length; index++) { temp += name[index] console.log(temp); } } printName(name)

Answer 5

This is how you could do it. I'm not sure if you wanted them to be object otherwise you could use string.substring

 let name = "mynameisprogrammer"; for (let index = 0; index < name.length; index++) { let finalData = name.split(""); console.log(finalData.slice(0,index+1).join("")); }