how to change single parts of a string in javascript?

Question

I want to accomplish the following:

var a = "hello"
var b 
b[0]=a[0]

so that

  b[0] 
 >"h"

the first letter of b should be the same as the first letter of a so I want to assign a[0] (which is h) to b[0]. I don't want to be restricted to the first letter, I want to use it to do things like

for(var i = 0; i<a; i++){
if( a.match(/[a-z]/i) !==null ){b[i] = " "}
else{b[i] = a[i]}

(replacing all the non-letters with spaces.) (this is just an example since I've been asked to clarify the question)

what you really want to achieve, your question points to empty — Akhil Aravind, May 23 '18 at 09:45
SO is not to teach you looping and things. Show us your work and ask questions on blockers. — Ravi Tiwari, May 23 '18 at 09:49
i want to change a[0] to be the same as b[0] but I can't modify single parts of a string — cubefox, May 23 '18 at 09:55

score 4 · Answer 1 · answered May 23 '18 at 09:46

4

You could desturct the string and take an object for changing a letter at a certain position and join it back to a string. Then assign it to the variable.

var a = "hello",
    b = "foo";

b = Object.assign([...b], { 0: a[0] }).join('');

console.log(b);

answered May 23 '18 at 09:46

Nina Scholz

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Any reason you chose `a[0]` instead of `a.charAt(0)`? – Chris May 23 '18 at 09:50
@Chris, it is shorter and it features the same rule as all iterative objects with an index. – Nina Scholz May 23 '18 at 09:52
1

Reading from https://stackoverflow.com/questions/5943726/string-charatx-or-stringx I guess it's only a matter of taste – Isaac May 23 '18 at 09:53

how to change single parts of a string in javascript?

1 Answers1