I have a string like this that is split up:
var tokens = "first>second>third>last".split(">");
What I would like in each iteration is for it to return
Iteration 0: "last"
Iteration 1: "third>last"
Iteration 2: "second>third>last"
Iteration 3: "first>second>third>last"
I am thinking of using decrementing index for loop.... but is there a more efficient approach ?
for (int w = tokens.length-1; w == 0; w--)
{
}
var tokens = "first>second>third>last".split(">");
var out = []
while(tokens.length) {
out.unshift(tokens.pop());
console.log(out.join('>'))
}
unshift() method of the array type should do what you want, but may not work in some versions of Internet Explorer.
out variable prior to printing it, not the input tokens.
OTOH this is the simplest aproach
var tokens = "first>second>third>last".split(">");
text = ''
for (w = tokens.length-1; w >= 0; w--)
{
if(text != ''){
text = tokens[w] + '>'+text;
}else{
text = tokens[w]
}
console.log(text);
}
join() method.You could try the following:
var tokens = "first>second>third>last".split(">");
for (var w = 0; w < tokens.length; w++)
{
var substr = tokens.slice(tokens.length - 1 - w, tokens.length).join(">");
console.log("Iteration " + w + ": " + substr)
}
You could also use join to reverse the original split. I'm not sure about efficiency but it's quite legible:
var tokens = 'first>second>third>last'.split('>');
for (var i = tokens.length - 1; i >= 0; --i) {
var subset = tokens.slice(i).join('>');
console.log(subset);
}
var tokens = "first>second>third>last".split(">");
var text = [];
for (var i = tokens.length; --i >= 0;) {
text.unshift(tokens[i]);
var str = text.join(">");
alert(str); // replace this with whatever you want to do with str
}
Should do the trick.
