Mixing
Javascript: How can I make Synchronous Loop?
1
I'm confused by Synchronous/Asynchronous processing of JavaScript.
What I want to do is below. When self_driving() is called, then get_direction_by_sensor() is called and using the direction, moter starts running by move_to_direction(direction). This process repeats 5 times.
function get_direction_by_sensor(){
// code for getting direction from sensor
return direction
};
function move_to_direction(direction){
direction = get_direction_by_sensor()
// code for driving motor to the direction
};
function self_driving_loop(maxCount, i) {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
}, 1000);
}
};
function self_driving() {
self_driving_loop(5, 1)
};
So I want this code to run like this.
1. get_direction_by_sensor()
1. move_to_direction()
2. get_direction_by_sensor()
2. move_to_direction()
3. get_direction_by_sensor()
3. move_to_direction()
4. get_direction_by_sensor()
4. move_to_direction()
5. get_direction_by_sensor()
5. move_to_direction()
But actually it runs like this.
1. get_direction_by_sensor()
2. get_direction_by_sensor()
3. get_direction_by_sensor()
4. get_direction_by_sensor()
5. get_direction_by_sensor() // this direction is used for moving
5. move_to_direction()
How can I fix this code?
Thanks.
======== MORE DETAILED INFO ========
move_to_direction() calles Macro of webiopi written by Python.
function move_to_direction() {
w().callMacro('get_direction_to_move', [TRIG_F ,ECHO_F ,TRIG_R ,ECHO_R ,TRIG_L ,ECHO_L ,TRIG_B ,ECHO_B], function(macro, args, resp) {
console.log(resp) // DEBUG
if(resp == "forward") {
change_direction('FOWARD');
} else if(resp == "right") {
change_direction('RIGHT');
} else if(resp == "left") {
change_direction('LEFT');
} else if(resp == "backward") {
change_direction('BACKWARD');
}
});
}
javascript loops synchronization
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
add a comment |
1
I'm confused by Synchronous/Asynchronous processing of JavaScript.
What I want to do is below. When self_driving() is called, then get_direction_by_sensor() is called and using the direction, moter starts running by move_to_direction(direction). This process repeats 5 times.
function get_direction_by_sensor(){
// code for getting direction from sensor
return direction
};
function move_to_direction(direction){
direction = get_direction_by_sensor()
// code for driving motor to the direction
};
function self_driving_loop(maxCount, i) {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
}, 1000);
}
};
function self_driving() {
self_driving_loop(5, 1)
};
So I want this code to run like this.
1. get_direction_by_sensor()
1. move_to_direction()
2. get_direction_by_sensor()
2. move_to_direction()
3. get_direction_by_sensor()
3. move_to_direction()
4. get_direction_by_sensor()
4. move_to_direction()
5. get_direction_by_sensor()
5. move_to_direction()
But actually it runs like this.
1. get_direction_by_sensor()
2. get_direction_by_sensor()
3. get_direction_by_sensor()
4. get_direction_by_sensor()
5. get_direction_by_sensor() // this direction is used for moving
5. move_to_direction()
How can I fix this code?
Thanks.
======== MORE DETAILED INFO ========
move_to_direction() calles Macro of webiopi written by Python.
function move_to_direction() {
w().callMacro('get_direction_to_move', [TRIG_F ,ECHO_F ,TRIG_R ,ECHO_R ,TRIG_L ,ECHO_L ,TRIG_B ,ECHO_B], function(macro, args, resp) {
console.log(resp) // DEBUG
if(resp == "forward") {
change_direction('FOWARD');
} else if(resp == "right") {
change_direction('RIGHT');
} else if(resp == "left") {
change_direction('LEFT');
} else if(resp == "backward") {
change_direction('BACKWARD');
}
});
}
javascript loops synchronization
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
@Bravo Yeah, some asynchrony inmove_to_directionfunction. What I want to do is finish all the (sub) functions inmove_to_directionand go to nextmove_to_direction.
– Hiromu Masuda
Nov 21 '18 at 3:36
add a comment |
1
1
1
I'm confused by Synchronous/Asynchronous processing of JavaScript.
What I want to do is below. When self_driving() is called, then get_direction_by_sensor() is called and using the direction, moter starts running by move_to_direction(direction). This process repeats 5 times.
function get_direction_by_sensor(){
// code for getting direction from sensor
return direction
};
function move_to_direction(direction){
direction = get_direction_by_sensor()
// code for driving motor to the direction
};
function self_driving_loop(maxCount, i) {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
}, 1000);
}
};
function self_driving() {
self_driving_loop(5, 1)
};
So I want this code to run like this.
1. get_direction_by_sensor()
1. move_to_direction()
2. get_direction_by_sensor()
2. move_to_direction()
3. get_direction_by_sensor()
3. move_to_direction()
4. get_direction_by_sensor()
4. move_to_direction()
5. get_direction_by_sensor()
5. move_to_direction()
But actually it runs like this.
1. get_direction_by_sensor()
2. get_direction_by_sensor()
3. get_direction_by_sensor()
4. get_direction_by_sensor()
5. get_direction_by_sensor() // this direction is used for moving
5. move_to_direction()
How can I fix this code?
Thanks.
======== MORE DETAILED INFO ========
move_to_direction() calles Macro of webiopi written by Python.
function move_to_direction() {
w().callMacro('get_direction_to_move', [TRIG_F ,ECHO_F ,TRIG_R ,ECHO_R ,TRIG_L ,ECHO_L ,TRIG_B ,ECHO_B], function(macro, args, resp) {
console.log(resp) // DEBUG
if(resp == "forward") {
change_direction('FOWARD');
} else if(resp == "right") {
change_direction('RIGHT');
} else if(resp == "left") {
change_direction('LEFT');
} else if(resp == "backward") {
change_direction('BACKWARD');
}
});
}
javascript loops synchronization
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
I'm confused by Synchronous/Asynchronous processing of JavaScript.
What I want to do is below. When self_driving() is called, then get_direction_by_sensor() is called and using the direction, moter starts running by move_to_direction(direction). This process repeats 5 times.
function get_direction_by_sensor(){
// code for getting direction from sensor
return direction
};
function move_to_direction(direction){
direction = get_direction_by_sensor()
// code for driving motor to the direction
};
function self_driving_loop(maxCount, i) {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
}, 1000);
}
};
function self_driving() {
self_driving_loop(5, 1)
};
So I want this code to run like this.
1. get_direction_by_sensor()
1. move_to_direction()
2. get_direction_by_sensor()
2. move_to_direction()
3. get_direction_by_sensor()
3. move_to_direction()
4. get_direction_by_sensor()
4. move_to_direction()
5. get_direction_by_sensor()
5. move_to_direction()
But actually it runs like this.
1. get_direction_by_sensor()
2. get_direction_by_sensor()
3. get_direction_by_sensor()
4. get_direction_by_sensor()
5. get_direction_by_sensor() // this direction is used for moving
5. move_to_direction()
How can I fix this code?
Thanks.
======== MORE DETAILED INFO ========
move_to_direction() calles Macro of webiopi written by Python.
function move_to_direction() {
w().callMacro('get_direction_to_move', [TRIG_F ,ECHO_F ,TRIG_R ,ECHO_R ,TRIG_L ,ECHO_L ,TRIG_B ,ECHO_B], function(macro, args, resp) {
console.log(resp) // DEBUG
if(resp == "forward") {
change_direction('FOWARD');
} else if(resp == "right") {
change_direction('RIGHT');
} else if(resp == "left") {
change_direction('LEFT');
} else if(resp == "backward") {
change_direction('BACKWARD');
}
});
}
javascript loops synchronization
javascript loops synchronization
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
edited Nov 21 '18 at 3:34
Hiromu Masuda
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
asked Nov 21 '18 at 3:22
Hiromu MasudaHiromu Masuda
719
719
I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
@Bravo Yeah, some asynchrony inmove_to_directionfunction. What I want to do is finish all the (sub) functions inmove_to_directionand go to nextmove_to_direction.
– Hiromu Masuda
Nov 21 '18 at 3:36
add a comment |
I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
@Bravo Yeah, some asynchrony inmove_to_directionfunction. What I want to do is finish all the (sub) functions inmove_to_directionand go to nextmove_to_direction.
– Hiromu Masuda
Nov 21 '18 at 3:36
I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
@Bravo Yeah, some asynchrony in
move_to_direction function. What I want to do is finish all the (sub) functions in move_to_direction and go to next move_to_direction.– Hiromu Masuda
Nov 21 '18 at 3:36
@Bravo Yeah, some asynchrony in
move_to_direction function. What I want to do is finish all the (sub) functions in move_to_direction and go to next move_to_direction.– Hiromu Masuda
Nov 21 '18 at 3:36
add a comment |
1 Answer
1
active
oldest
votes
2
settimeout must be wrapped with a promise so that it can be awaited. see
function self_driving_loop(maxCount, i) {
return new Promise(resolve => {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
resolve()
}, 1000);
}
})
};
call it this way in an async function
await self_driving_loop(maxCount, i)
answered Nov 21 '18 at 3:35
EJLEJL
615
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:self_driving_loop(maxCount, i), didnt work:await self_driving_loop(maxCount, i)
– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
settimeout must be wrapped with a promise so that it can be awaited. see
function self_driving_loop(maxCount, i) {
return new Promise(resolve => {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
resolve()
}, 1000);
}
})
};
call it this way in an async function
await self_driving_loop(maxCount, i)
answered Nov 21 '18 at 3:35
EJLEJL
615
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:self_driving_loop(maxCount, i), didnt work:await self_driving_loop(maxCount, i)
– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
add a comment |
2
settimeout must be wrapped with a promise so that it can be awaited. see
function self_driving_loop(maxCount, i) {
return new Promise(resolve => {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
resolve()
}, 1000);
}
})
};
call it this way in an async function
await self_driving_loop(maxCount, i)
answered Nov 21 '18 at 3:35
EJLEJL
615
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:self_driving_loop(maxCount, i), didnt work:await self_driving_loop(maxCount, i)
– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
add a comment |
2
2
2
settimeout must be wrapped with a promise so that it can be awaited. see
function self_driving_loop(maxCount, i) {
return new Promise(resolve => {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
resolve()
}, 1000);
}
})
};
call it this way in an async function
await self_driving_loop(maxCount, i)
answered Nov 21 '18 at 3:35
EJLEJL
615
settimeout must be wrapped with a promise so that it can be awaited. see
function self_driving_loop(maxCount, i) {
return new Promise(resolve => {
if (i <= maxCount) {
move_to_direction();
setTimeout(function(){
self_driving_loop(maxCount, ++i)
resolve()
}, 1000);
}
})
};
call it this way in an async function
await self_driving_loop(maxCount, i)
answered Nov 21 '18 at 3:35
EJLEJL
615
answered Nov 21 '18 at 3:35
EJLEJL
615
answered Nov 21 '18 at 3:35
EJLEJL
615
answered Nov 21 '18 at 3:35
EJLEJL
615
615
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:self_driving_loop(maxCount, i), didnt work:await self_driving_loop(maxCount, i)
– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
add a comment |
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:self_driving_loop(maxCount, i), didnt work:await self_driving_loop(maxCount, i)
– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
Are you sure it works? it looks wrong
– Bravo
Nov 21 '18 at 3:46
did work:
self_driving_loop(maxCount, i) , didnt work: await self_driving_loop(maxCount, i)– Hiromu Masuda
Nov 21 '18 at 7:14
did work:
self_driving_loop(maxCount, i) , didnt work: await self_driving_loop(maxCount, i)– Hiromu Masuda
Nov 21 '18 at 7:14
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
it will work for async function please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– EJL
Nov 22 '18 at 5:00
add a comment |
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I guess you'll need to show a little more about those two functions - must have asynchrony in them, right?
– Bravo
Nov 21 '18 at 3:28
the code is doing what you want repl.it/repls/CostlyBonyApplets
– Pablo Fernandez
Nov 21 '18 at 3:29
@Bravo Yeah, some asynchrony in
move_to_directionfunction. What I want to do is finish all the (sub) functions inmove_to_directionand go to nextmove_to_direction.– Hiromu Masuda
Nov 21 '18 at 3:36